257888791990 has 16 divisors (see below), whose sum is σ = 479174014080. Its totient is φ = 99827919360.

The previous prime is 257888791973. The next prime is 257888792003. The reversal of 257888791990 is 99197888752.

It is a happy number.

It is a super-2 number, since 2×257888791990² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415949355 + ... + 415949974.

It is an arithmetic number, because the mean of its divisors is an integer number (29948375880).

Almost surely, 2^257888791990 is an apocalyptic number.

257888791990 is a deficient number, since it is larger than the sum of its proper divisors (221285222090).

257888791990 is a wasteful number, since it uses less digits than its factorization.

257888791990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831899367.

The product of its (nonzero) digits is 182891520, while the sum is 73.

The spelling of 257888791990 in words is "two hundred fifty-seven billion, eight hundred eighty-eight million, seven hundred ninety-one thousand, nine hundred ninety".