252816781 has 8 divisors (see below), whose sum is σ = 289125504. Its totient is φ = 216556080.

The previous prime is 252816779. The next prime is 252816799. The reversal of 252816781 is 187618252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252816781 - 2¹ = 252816779 is a prime.

It is a super-2 number, since 2×252816781² = 127832649510403922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252816721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96 + ... + 22486.

It is an arithmetic number, because the mean of its divisors is an integer number (36140688).

Almost surely, 2^252816781 is an apocalyptic number.

It is an amenable number.

252816781 is a deficient number, since it is larger than the sum of its proper divisors (36308723).

252816781 is a wasteful number, since it uses less digits than its factorization.

252816781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24011.

The product of its digits is 53760, while the sum is 40.

The square root of 252816781 is about 15900.2132375638. The cubic root of 252816781 is about 632.3176421281.

The spelling of 252816781 in words is "two hundred fifty-two million, eight hundred sixteen thousand, seven hundred eighty-one".