64535520 has 96 divisors (see below), whose sum is σ = 232339968. Its totient is φ = 14750208.

The previous prime is 64535509. The next prime is 64535563. The reversal of 64535520 is 2553546.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6244 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (2420208).

Almost surely, 2^64535520 is an apocalyptic number.

64535520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64535520 is an abundant number, since it is smaller than the sum of its proper divisors (167804448).

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

64535520 is a wasteful number, since it uses less digits than its factorization.

64535520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19232 (or 19224 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 64535520 is about 8033.4002763462. The cubic root of 64535520 is about 401.1125692716.

The spelling of 64535520 in words is "sixty-four million, five hundred thirty-five thousand, five hundred twenty".