70864731 has 72 divisors (see below), whose sum is σ = 126373104. Its totient is φ = 38102400.

The previous prime is 70864727. The next prime is 70864733. The reversal of 70864731 is 13746807.

70864731 is a `hidden beast` number, since 7 + 0 + 8 + 647 + 3 + 1 = 666.

It is not a de Polignac number, because 70864731 - 2² = 70864727 is a prime.

It is a super-2 number, since 2×70864731² = 10043620199404722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70864733) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 701581 + ... + 701681.

It is an arithmetic number, because the mean of its divisors is an integer number (1755182).

Almost surely, 2^70864731 is an apocalyptic number.

70864731 is a deficient number, since it is larger than the sum of its proper divisors (55508373).

70864731 is a wasteful number, since it uses less digits than its factorization.

70864731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 70864731 is about 8418.1192079941. The cubic root of 70864731 is about 413.8186386189.

The spelling of 70864731 in words is "seventy million, eight hundred sixty-four thousand, seven hundred thirty-one".