690918641 has 16 divisors (see below), whose sum is σ = 880076160. Its totient is φ = 528042240.

The previous prime is 690918637. The next prime is 690918661. The reversal of 690918641 is 146819096.

690918641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 690918641 - 2² = 690918637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690918592 and 690918601.

It is not an unprimeable number, because it can be changed into a prime (690918601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150530 + ... + 155051.

It is an arithmetic number, because the mean of its divisors is an integer number (55004760).

Almost surely, 2^690918641 is an apocalyptic number.

It is an amenable number.

690918641 is a deficient number, since it is larger than the sum of its proper divisors (189157519).

690918641 is a wasteful number, since it uses less digits than its factorization.

690918641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305624.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 690918641 is about 26285.3312895234. The cubic root of 690918641 is about 884.0475740147.

The spelling of 690918641 in words is "six hundred ninety million, nine hundred eighteen thousand, six hundred forty-one".