690297816 has 64 divisors (see below), whose sum is σ = 1956326400. Its totient is φ = 201218688.

The previous prime is 690297809. The next prime is 690297823. The reversal of 690297816 is 618792096.

It is an interprime number because it is at equal distance from previous prime (690297809) and next prime (690297823).

It is a super-2 number, since 2×690297816² = 953022149548739712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52296 + ... + 64151.

It is an arithmetic number, because the mean of its divisors is an integer number (30567600).

Almost surely, 2^690297816 is an apocalyptic number.

It is an amenable number.

690297816 is an abundant number, since it is smaller than the sum of its proper divisors (1266028584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690297816 is a wasteful number, since it uses less digits than its factorization.

690297816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116488 (or 116484 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 690297816 is about 26273.5192922456. The cubic root of 690297816 is about 883.7827076609.

The spelling of 690297816 in words is "six hundred ninety million, two hundred ninety-seven thousand, eight hundred sixteen".