252640278 has 48 divisors (see below), whose sum is σ = 611734032. Its totient is φ = 74688000.

The previous prime is 252640277. The next prime is 252640279. The reversal of 252640278 is 872046252.

252640278 is a `hidden beast` number, since 2 + 5 + 2 + 640 + 2 + 7 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (252640277) and next prime (252640279).

It is a super-2 number, since 2×252640278² = 127654220135834568, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252640273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7443 + ... + 23678.

It is an arithmetic number, because the mean of its divisors is an integer number (12744459).

Almost surely, 2^252640278 is an apocalyptic number.

252640278 is an abundant number, since it is smaller than the sum of its proper divisors (359093754).

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

252640278 is a wasteful number, since it uses less digits than its factorization.

252640278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31181 (or 31178 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 252640278 is about 15894.6619341212. The cubic root of 252640278 is about 632.1704578802.

The spelling of 252640278 in words is "two hundred fifty-two million, six hundred forty thousand, two hundred seventy-eight".