690900979 has 6 divisors (see below), whose sum is σ = 722246756. Its totient is φ = 660861300.

The previous prime is 690900949. The next prime is 690900983. The reversal of 690900979 is 979009096.

It is a happy number.

It is not a de Polignac number, because 690900979 - 2¹⁹ = 690376691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690900949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 652497 + ... + 653554.

Almost surely, 2^690900979 is an apocalyptic number.

690900979 is a deficient number, since it is larger than the sum of its proper divisors (31345777).

690900979 is a wasteful number, since it uses less digits than its factorization.

690900979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306097 (or 1306074 counting only the distinct ones).

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 690900979 is about 26284.9953205246. The cubic root of 690900979 is about 884.0400409612.

The spelling of 690900979 in words is "six hundred ninety million, nine hundred thousand, nine hundred seventy-nine".