257580078 has 32 divisors (see below), whose sum is σ = 591369984. Its totient is φ = 73267392.

The previous prime is 257580067. The next prime is 257580079. The reversal of 257580078 is 870085752.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257580079) 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, 3975 + ... + 23042.

It is an arithmetic number, because the mean of its divisors is an integer number (18480312).

Almost surely, 2^257580078 is an apocalyptic number.

257580078 is an abundant number, since it is smaller than the sum of its proper divisors (333789906).

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

257580078 is a wasteful number, since it uses less digits than its factorization.

257580078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27256.

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 257580078 is about 16049.3014801268. The cubic root of 257580078 is about 636.2641055332.

The spelling of 257580078 in words is "two hundred fifty-seven million, five hundred eighty thousand, seventy-eight".