689161956 has 48 divisors (see below), whose sum is σ = 1840097280. Its totient is φ = 196653600.

The previous prime is 689161937. The next prime is 689161969. The reversal of 689161956 is 659161986.

It is a super-3 number, since 3×689161956³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 689161899 and 689161908.

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, 67381 + ... + 76931.

It is an arithmetic number, because the mean of its divisors is an integer number (38335360).

Almost surely, 2^689161956 is an apocalyptic number.

It is an amenable number.

689161956 is an abundant number, since it is smaller than the sum of its proper divisors (1150935324).

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

689161956 is a wasteful number, since it uses less digits than its factorization.

689161956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10424 (or 10422 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The square root of 689161956 is about 26251.8943316478. The cubic root of 689161956 is about 883.2976974192.

The spelling of 689161956 in words is "six hundred eighty-nine million, one hundred sixty-one thousand, nine hundred fifty-six".