257680878 has 32 divisors (see below), whose sum is σ = 634292736. Its totient is φ = 67959648.

The previous prime is 257680877. The next prime is 257680879. The reversal of 257680878 is 878086752.

It is an interprime number because it is at equal distance from previous prime (257680877) and next prime (257680879).

It is a self number, because there is not a number n which added to its sum of digits gives 257680878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257680873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235426 + ... + 236517.

It is an arithmetic number, because the mean of its divisors is an integer number (19821648).

Almost surely, 2^257680878 is an apocalyptic number.

257680878 is an abundant number, since it is smaller than the sum of its proper divisors (376611858).

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

257680878 is a wasteful number, since it uses less digits than its factorization.

257680878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471968.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The square root of 257680878 is about 16052.4414965450. The cubic root of 257680878 is about 636.3470920980.

The spelling of 257680878 in words is "two hundred fifty-seven million, six hundred eighty thousand, eight hundred seventy-eight".