64532390 has 64 divisors (see below), whose sum is σ = 131604480. Its totient is φ = 22619520.

The previous prime is 64532389. The next prime is 64532393. The reversal of 64532390 is 9323546.

It is a super-2 number, since 2×64532390² = 8328858718224200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64532393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269891 + ... + 270129.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^64532390 is an apocalyptic number.

64532390 is an abundant number, since it is smaller than the sum of its proper divisors (67072090).

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

64532390 is a wasteful number, since it uses less digits than its factorization.

64532390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 64532390 is about 8033.2054623295. The cubic root of 64532390 is about 401.1060844571.

The spelling of 64532390 in words is "sixty-four million, five hundred thirty-two thousand, three hundred ninety".