690779776 has 16 divisors (see below), whose sum is σ = 1376163090. Its totient is φ = 345389824.

The previous prime is 690779773. The next prime is 690779783. The reversal of 690779776 is 677977096.

It can be written as a sum of positive squares in only one way, i.e., 690638400 + 141376 = 26280^2 + 376^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×690779776² = 954353397861220352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 690779776.

It is not an unprimeable number, because it can be changed into a prime (690779773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2698231 + ... + 2698486.

Almost surely, 2^690779776 is an apocalyptic number.

It is an amenable number.

690779776 is a deficient number, since it is larger than the sum of its proper divisors (685383314).

690779776 is an equidigital number, since it uses as much as digits as its factorization.

690779776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396731 (or 5396719 counting only the distinct ones).

The product of its (nonzero) digits is 7001316, while the sum is 58.

The square root of 690779776 is about 26282.6896644921. The cubic root of 690779776 is about 883.9883429733.

The spelling of 690779776 in words is "six hundred ninety million, seven hundred seventy-nine thousand, seven hundred seventy-six".