64490976 has 72 divisors (see below), whose sum is σ = 200078424. Its totient is φ = 19541760.

The previous prime is 64490957. The next prime is 64490977. The reversal of 64490976 is 67909446.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64490977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7011 + ... + 13346.

It is an arithmetic number, because the mean of its divisors is an integer number (2778867).

Almost surely, 2^64490976 is an apocalyptic number.

64490976 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

64490976 is an abundant number, since it is smaller than the sum of its proper divisors (135587448).

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

64490976 is a wasteful number, since it uses less digits than its factorization.

64490976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20384 (or 20373 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 64490976 is about 8030.6273727524. The cubic root of 64490976 is about 401.0202621171.

The spelling of 64490976 in words is "sixty-four million, four hundred ninety thousand, nine hundred seventy-six".