68985831 has 4 divisors (see below), whose sum is σ = 91981112. Its totient is φ = 45990552.

The previous prime is 68985823. The next prime is 68985841. The reversal of 68985831 is 13858986.

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

It is not a de Polignac number, because 68985831 - 2³ = 68985823 is a prime.

It is a super-2 number, since 2×68985831² = 9518089757521122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68985811) 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, 11497636 + ... + 11497641.

It is an arithmetic number, because the mean of its divisors is an integer number (22995278).

Almost surely, 2^68985831 is an apocalyptic number.

68985831 is a deficient number, since it is larger than the sum of its proper divisors (22995281).

68985831 is a wasteful number, since it uses less digits than its factorization.

68985831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22995280.

The product of its digits is 414720, while the sum is 48.

The square root of 68985831 is about 8305.7709455535. The cubic root of 68985831 is about 410.1285161267.

The spelling of 68985831 in words is "sixty-eight million, nine hundred eighty-five thousand, eight hundred thirty-one".