252780756 has 12 divisors (see below), whose sum is σ = 589821792. Its totient is φ = 84260248.

The previous prime is 252780751. The next prime is 252780779. The reversal of 252780756 is 657087252.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×252780756² = 127796221207863072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252780751) 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 3 ways as a sum of consecutive naturals, for example, 10532520 + ... + 10532543.

It is an arithmetic number, because the mean of its divisors is an integer number (49151816).

Almost surely, 2^252780756 is an apocalyptic number.

It is an amenable number.

252780756 is an abundant number, since it is smaller than the sum of its proper divisors (337041036).

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

252780756 is a wasteful number, since it uses less digits than its factorization.

252780756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21065070 (or 21065068 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 42.

The square root of 252780756 is about 15899.0803507624. The cubic root of 252780756 is about 632.2876067734.

The spelling of 252780756 in words is "two hundred fifty-two million, seven hundred eighty thousand, seven hundred fifty-six".