689631970 has 16 divisors (see below), whose sum is σ = 1250400888. Its totient is φ = 273838720.

The previous prime is 689631941. The next prime is 689631989. The reversal of 689631970 is 79136986.

689631970 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 373610241 + 316021729 = 19329^2 + 17777^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250321 + ... + 253060.

Almost surely, 2^689631970 is an apocalyptic number.

689631970 is a deficient number, since it is larger than the sum of its proper divisors (560768918).

689631970 is a wasteful number, since it uses less digits than its factorization.

689631970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503525.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 689631970 is about 26260.8448074315. The cubic root of 689631970 is about 883.4984571655.

The spelling of 689631970 in words is "six hundred eighty-nine million, six hundred thirty-one thousand, nine hundred seventy".