70020657 has 18 divisors (see below), whose sum is σ = 117654498. Its totient is φ = 40011552.

The previous prime is 70020653. The next prime is 70020677. The reversal of 70020657 is 75602007.

70020657 is a `hidden beast` number, since 7 + 0 + 0 + 2 + 0 + 657 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55890576 + 14130081 = 7476^2 + 3759^2 .

It is not a de Polignac number, because 70020657 - 2² = 70020653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70020657.

It is not an unprimeable number, because it can be changed into a prime (70020653) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 78948 + ... + 79829.

It is an arithmetic number, because the mean of its divisors is an integer number (6536361).

Almost surely, 2^70020657 is an apocalyptic number.

It is an amenable number.

70020657 is a deficient number, since it is larger than the sum of its proper divisors (47633841).

70020657 is a wasteful number, since it uses less digits than its factorization.

70020657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158797 (or 158787 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 70020657 is about 8367.8346661487. The cubic root of 70020657 is about 412.1690657035.

The spelling of 70020657 in words is "seventy million, twenty thousand, six hundred fifty-seven".