690634431 has 24 divisors (see below), whose sum is σ = 1035949824. Its totient is φ = 459791640.

The previous prime is 690634387. The next prime is 690634433. The reversal of 690634431 is 134436096.

It is not a de Polignac number, because 690634431 - 2¹³ = 690626239 is a prime.

It is a super-2 number, since 2×690634431² = 953951834565387522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690634433) 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, 234490 + ... + 237416.

It is an arithmetic number, because the mean of its divisors is an integer number (43164576).

Almost surely, 2^690634431 is an apocalyptic number.

690634431 is a deficient number, since it is larger than the sum of its proper divisors (345315393).

690634431 is an equidigital number, since it uses as much as digits as its factorization.

690634431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3913 (or 3901 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 690634431 is about 26279.9244861929. The cubic root of 690634431 is about 883.9263394702.

The spelling of 690634431 in words is "six hundred ninety million, six hundred thirty-four thousand, four hundred thirty-one".