70257978 has 48 divisors (see below), whose sum is σ = 174620160. Its totient is φ = 19999008.

The previous prime is 70257977. The next prime is 70258043. The reversal of 70257978 is 87975207.

70257978 is a `hidden beast` number, since 7 + 0 + 2 + 579 + 78 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (70257977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39063 + ... + 40821.

It is an arithmetic number, because the mean of its divisors is an integer number (3637920).

Almost surely, 2^70257978 is an apocalyptic number.

70257978 is an abundant number, since it is smaller than the sum of its proper divisors (104362182).

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

70257978 is a wasteful number, since it uses less digits than its factorization.

70257978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091 (or 2088 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 70257978 is about 8382.0032211876. The cubic root of 70257978 is about 412.6341954569.

The spelling of 70257978 in words is "seventy million, two hundred fifty-seven thousand, nine hundred seventy-eight".