70002731 has 4 divisors (see below), whose sum is σ = 73046352. Its totient is φ = 66959112.

The previous prime is 70002727. The next prime is 70002791. The reversal of 70002731 is 13720007.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70002731 - 2² = 70002727 is a prime.

It is a super-2 number, since 2×70002731² = 9800764694916722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70002721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521776 + ... + 1521821.

It is an arithmetic number, because the mean of its divisors is an integer number (18261588).

Almost surely, 2^70002731 is an apocalyptic number.

70002731 is a deficient number, since it is larger than the sum of its proper divisors (3043621).

70002731 is a wasteful number, since it uses less digits than its factorization.

70002731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043620.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 70002731 is about 8366.7634722155. The cubic root of 70002731 is about 412.1338895446.

Adding to 70002731 its reverse (13720007), we get a palindrome (83722738).

The spelling of 70002731 in words is "seventy million, two thousand, seven hundred thirty-one".