70972813 has 8 divisors (see below), whose sum is σ = 71569080. Its totient is φ = 70379520.

The previous prime is 70972793. The next prime is 70972817. The reversal of 70972813 is 31827907.

It can be written as a sum of positive squares in 4 ways, for example, as 362404 + 70610409 = 602^2 + 8403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 70972813 - 2⁹ = 70972301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70972817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75933 + ... + 76861.

It is an arithmetic number, because the mean of its divisors is an integer number (8946135).

Almost surely, 2^70972813 is an apocalyptic number.

It is an amenable number.

70972813 is a deficient number, since it is larger than the sum of its proper divisors (596267).

70972813 is a wasteful number, since it uses less digits than its factorization.

70972813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 70972813 is about 8424.5363670650. The cubic root of 70972813 is about 414.0289154191.

The spelling of 70972813 in words is "seventy million, nine hundred seventy-two thousand, eight hundred thirteen".