257218996 has 24 divisors (see below), whose sum is σ = 458640000. Its totient is φ = 126187584.

The previous prime is 257218981. The next prime is 257218999. The reversal of 257218996 is 699812752.

It is a super-2 number, since 2×257218996² = 132323223806496032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257218999) 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, 244680 + ... + 245728.

It is an arithmetic number, because the mean of its divisors is an integer number (19110000).

Almost surely, 2^257218996 is an apocalyptic number.

It is an amenable number.

257218996 is a deficient number, since it is larger than the sum of its proper divisors (201421004).

257218996 is a wasteful number, since it uses less digits than its factorization.

257218996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151 (or 2149 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 257218996 is about 16038.0483850124. The cubic root of 257218996 is about 635.9666563482.

The spelling of 257218996 in words is "two hundred fifty-seven million, two hundred eighteen thousand, nine hundred ninety-six".