64513520 has 40 divisors (see below), whose sum is σ = 150351984. Its totient is φ = 25743872.

The previous prime is 64513517. The next prime is 64513549. The reversal of 64513520 is 2531546.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 64513520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48707 + ... + 50013.

Almost surely, 2^64513520 is an apocalyptic number.

It is an amenable number.

64513520 is an abundant number, since it is smaller than the sum of its proper divisors (85838464).

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

64513520 is a wasteful number, since it uses less digits than its factorization.

64513520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 64513520 is about 8032.0308764347. The cubic root of 64513520 is about 401.0669846620.

It can be divided in two parts, 6 and 4513520, that multiplied together give a triangular number (27081120 = T₇₃₅₉).

The spelling of 64513520 in words is "sixty-four million, five hundred thirteen thousand, five hundred twenty".