64252840 has 16 divisors (see below), whose sum is σ = 144568980. Its totient is φ = 25701120.

The previous prime is 64252763. The next prime is 64252841. The reversal of 64252840 is 4825246.

It can be written as a sum of positive squares in 2 ways, for example, as 63011844 + 1240996 = 7938^2 + 1114^2 .

It is not an unprimeable number, because it can be changed into a prime (64252841) 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, 803121 + ... + 803200.

Almost surely, 2^64252840 is an apocalyptic number.

It is an amenable number.

64252840 is an abundant number, since it is smaller than the sum of its proper divisors (80316140).

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

64252840 is a wasteful number, since it uses less digits than its factorization.

64252840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606332 (or 1606328 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 64252840 is about 8015.7869233158. The cubic root of 64252840 is about 400.5260578545.

The spelling of 64252840 in words is "sixty-four million, two hundred fifty-two thousand, eight hundred forty".