64650000 has 120 divisors (see below), whose sum is σ = 209236608. Its totient is φ = 17200000.

The previous prime is 64649969. The next prime is 64650011. The reversal of 64650000 is 5646.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149785 + ... + 150215.

Almost surely, 2^64650000 is an apocalyptic number.

64650000 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 64650000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104618304).

64650000 is an abundant number, since it is smaller than the sum of its proper divisors (144586608).

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

64650000 is an equidigital number, since it uses as much as digits as its factorization.

64650000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 64650000 is about 8040.5223710901. The cubic root of 64650000 is about 401.3496079414.

Adding to 64650000 its reverse (5646), we get a palindrome (64655646).

The spelling of 64650000 in words is "sixty-four million, six hundred fifty thousand".