690289731 has 12 divisors (see below), whose sum is σ = 1040437008. Its totient is φ = 440184624.

The previous prime is 690289729. The next prime is 690289751. The reversal of 690289731 is 137982096.

It is not a de Polignac number, because 690289731 - 2¹ = 690289729 is a prime.

It is a super-2 number, since 2×690289731² = 952999825448104722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690289751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1667160 + ... + 1667573.

It is an arithmetic number, because the mean of its divisors is an integer number (86703084).

Almost surely, 2^690289731 is an apocalyptic number.

690289731 is a deficient number, since it is larger than the sum of its proper divisors (350147277).

690289731 is a wasteful number, since it uses less digits than its factorization.

690289731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334762 (or 3334759 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 690289731 is about 26273.3654296514. The cubic root of 690289731 is about 883.7792572607.

The spelling of 690289731 in words is "six hundred ninety million, two hundred eighty-nine thousand, seven hundred thirty-one".