64494520 has 16 divisors (see below), whose sum is σ = 145112760. Its totient is φ = 25797792.

The previous prime is 64494509. The next prime is 64494527. The reversal of 64494520 is 2549446.

It is a super-2 number, since 2×64494520² = 8319086220060800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64494527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806142 + ... + 806221.

Almost surely, 2^64494520 is an apocalyptic number.

It is an amenable number.

64494520 is an abundant number, since it is smaller than the sum of its proper divisors (80618240).

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

64494520 is a wasteful number, since it uses less digits than its factorization.

64494520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612374 (or 1612370 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 64494520 is about 8030.8480249598. The cubic root of 64494520 is about 401.0276077949.

The spelling of 64494520 in words is "sixty-four million, four hundred ninety-four thousand, five hundred twenty".