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64800000 = 283455

64800000 has 270 divisors, whose sum is σ = 241511886. Its totient is φ = 17280000.

The previous prime is 64799953. The next prime is 64800037. The reversal of 64800000 is 846.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 29942784 + 34857216 = 5472^2 + 5904^2 .

It is a tau number, because it is divible by the number of its divisors (270).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 12959998 + ... + 12960002.

Almost surely, 264800000 is an apocalyptic number.

64800000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120755943).

64800000 is an abundant number, since it is smaller than the sum of its proper divisors (176711886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64800000 is an frugal number, since it uses more digits than its factorization.

64800000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 64800000 is about 8049.8447189992. The cubic root of 64800000 is about 401.6597700493.

Adding to 64800000 its reverse (846), we get a palindrome (64800846).

The spelling of 64800000 in words is "sixty-four million, eight hundred thousand".