64863720 has 256 divisors, whose sum is σ = 237600000. Its totient is φ = 15676416.

The previous prime is 64863707. The next prime is 64863727. The reversal of 64863720 is 2736846.

64863720 is a `hidden beast` number, since 648 + 6 + 3 + 7 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64863727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 595026 + ... + 595134.

It is an arithmetic number, because the mean of its divisors is an integer number (928125).

Almost surely, 2^64863720 is an apocalyptic number.

64863720 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 64863720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118800000).

64863720 is an abundant number, since it is smaller than the sum of its proper divisors (172736280).

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

64863720 is a wasteful number, since it uses less digits than its factorization.

64863720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 64863720 is about 8053.8015868284. The cubic root of 64863720 is about 401.7913820661.

The spelling of 64863720 in words is "sixty-four million, eight hundred sixty-three thousand, seven hundred twenty".