70999731 has 24 divisors (see below), whose sum is σ = 112779264. Its totient is φ = 42683760.

The previous prime is 70999723. The next prime is 70999739. The reversal of 70999731 is 13799907.

It is an interprime number because it is at equal distance from previous prime (70999723) and next prime (70999739).

It is not a de Polignac number, because 70999731 - 2³ = 70999723 is a prime.

It is a super-2 number, since 2×70999731² = 10081923604144722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70999739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9750 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (4699136).

Almost surely, 2^70999731 is an apocalyptic number.

70999731 is a deficient number, since it is larger than the sum of its proper divisors (41779533).

70999731 is a wasteful number, since it uses less digits than its factorization.

70999731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791 (or 5788 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 70999731 is about 8426.1338109479. The cubic root of 70999731 is about 414.0812519933.

The spelling of 70999731 in words is "seventy million, nine hundred ninety-nine thousand, seven hundred thirty-one".