70561257 has 32 divisors (see below), whose sum is σ = 105259392. Its totient is φ = 41762304.

The previous prime is 70561219. The next prime is 70561261. The reversal of 70561257 is 75216507.

It is not a de Polignac number, because 70561257 - 2⁷ = 70561129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70561297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154173 + ... + 154629.

It is an arithmetic number, because the mean of its divisors is an integer number (3289356).

Almost surely, 2^70561257 is an apocalyptic number.

It is an amenable number.

70561257 is a deficient number, since it is larger than the sum of its proper divisors (34698135).

70561257 is a wasteful number, since it uses less digits than its factorization.

70561257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 70561257 is about 8400.0748210953. The cubic root of 70561257 is about 413.2270754580.

The spelling of 70561257 in words is "seventy million, five hundred sixty-one thousand, two hundred fifty-seven".