257339988 has 36 divisors (see below), whose sum is σ = 651312480. Its totient is φ = 85672656.

The previous prime is 257339983. The next prime is 257340019. The reversal of 257339988 is 889933752.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257339983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27903 + ... + 35961.

Almost surely, 2^257339988 is an apocalyptic number.

It is an amenable number.

257339988 is an abundant number, since it is smaller than the sum of its proper divisors (393972492).

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

257339988 is a wasteful number, since it uses less digits than its factorization.

257339988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8956 (or 8951 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 257339988 is about 16041.8199715618. The cubic root of 257339988 is about 636.0663571443.

It can be divided in two parts, 25733 and 9988, that added together give a square (35721 = 189²).

The spelling of 257339988 in words is "two hundred fifty-seven million, three hundred thirty-nine thousand, nine hundred eighty-eight".