690031881 has 48 divisors (see below), whose sum is σ = 1247920128. Its totient is φ = 356940000.

The previous prime is 690031877. The next prime is 690031897. The reversal of 690031881 is 188130096.

It is not a de Polignac number, because 690031881 - 2² = 690031877 is a prime.

It is a super-2 number, since 2×690031881² = 952287993592796322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690030881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 171960 + ... + 175926.

It is an arithmetic number, because the mean of its divisors is an integer number (25998336).

Almost surely, 2^690031881 is an apocalyptic number.

It is an amenable number.

690031881 is a deficient number, since it is larger than the sum of its proper divisors (557888247).

690031881 is a wasteful number, since it uses less digits than its factorization.

690031881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242 (or 4239 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 690031881 is about 26268.4579105817. The cubic root of 690031881 is about 883.6692016075.

It can be divided in two parts, 6900 and 31881, that added together give a triangular number (38781 = T₂₇₈).

The spelling of 690031881 in words is "six hundred ninety million, thirty-one thousand, eight hundred eighty-one".