252785457 has 24 divisors (see below), whose sum is σ = 368792424. Its totient is φ = 166846464.

The previous prime is 252785399. The next prime is 252785471. The reversal of 252785457 is 754587252.

252785457 is a `hidden beast` number, since 2 + 527 + 85 + 45 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 183629601 + 69155856 = 13551^2 + 8316^2 .

It is a de Polignac number, because none of the positive numbers 2^k-252785457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252783457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 677523 + ... + 677895.

It is an arithmetic number, because the mean of its divisors is an integer number (15366351).

Almost surely, 2^252785457 is an apocalyptic number.

It is an amenable number.

252785457 is a deficient number, since it is larger than the sum of its proper divisors (116006967).

252785457 is a wasteful number, since it uses less digits than its factorization.

252785457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 926 counting only the distinct ones).

The product of its digits is 784000, while the sum is 45.

The square root of 252785457 is about 15899.2281888147. The cubic root of 252785457 is about 632.2915263302.

The spelling of 252785457 in words is "two hundred fifty-two million, seven hundred eighty-five thousand, four hundred fifty-seven".