690298631 has 8 divisors (see below), whose sum is σ = 765398928. Its totient is φ = 617256000.

The previous prime is 690298621. The next prime is 690298649. The reversal of 690298631 is 136892096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690298631 is a prime.

It is a super-2 number, since 2×690298631² = 953024399920948322, 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 (690298621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513710 + ... + 515051.

It is an arithmetic number, because the mean of its divisors is an integer number (95674866).

Almost surely, 2^690298631 is an apocalyptic number.

690298631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

690298631 is a deficient number, since it is larger than the sum of its proper divisors (75100297).

690298631 is a wasteful number, since it uses less digits than its factorization.

690298631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028833.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 690298631 is about 26273.5348021540. The cubic root of 690298631 is about 883.7830554734.

The spelling of 690298631 in words is "six hundred ninety million, two hundred ninety-eight thousand, six hundred thirty-one".