64532520 has 96 divisors (see below), whose sum is σ = 225880200. Its totient is φ = 15883776.

The previous prime is 64532519. The next prime is 64532521. The reversal of 64532520 is 2523546.

It is an interprime number because it is at equal distance from previous prime (64532519) and next prime (64532521).

It can be written as a sum of positive squares in 4 ways, for example, as 56881764 + 7650756 = 7542^2 + 2766^2 .

It is a super-2 number, since 2×64532520² = 8328892275100800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64532521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2215 + ... + 11574.

Almost surely, 2^64532520 is an apocalyptic number.

64532520 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 64532520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112940100).

64532520 is an abundant number, since it is smaller than the sum of its proper divisors (161347680).

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

64532520 is a wasteful number, since it uses less digits than its factorization.

64532520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13819 (or 13812 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 64532520 is about 8033.2135537405. The cubic root of 64532520 is about 401.1063537986.

The spelling of 64532520 in words is "sixty-four million, five hundred thirty-two thousand, five hundred twenty".