70993731 has 16 divisors (see below), whose sum is σ = 97121024. Its totient is φ = 46103904.

The previous prime is 70993723. The next prime is 70993733. The reversal of 70993731 is 13739907.

It is not a de Polignac number, because 70993731 - 2³ = 70993723 is a prime.

It is a super-2 number, since 2×70993731² = 10080219682600722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70993731.

It is not an unprimeable number, because it can be changed into a prime (70993733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93405 + ... + 94161.

It is an arithmetic number, because the mean of its divisors is an integer number (6070064).

Almost surely, 2^70993731 is an apocalyptic number.

70993731 is a deficient number, since it is larger than the sum of its proper divisors (26127293).

70993731 is a wasteful number, since it uses less digits than its factorization.

70993731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 35721, while the sum is 39.

The square root of 70993731 is about 8425.7777682538. Note that the first 4 decimals coincide. The cubic root of 70993731 is about 414.0695873599.

The spelling of 70993731 in words is "seventy million, nine hundred ninety-three thousand, seven hundred thirty-one".