689917780 has 24 divisors (see below), whose sum is σ = 1451949408. Its totient is φ = 275372448.

The previous prime is 689917763. The next prime is 689917807. The reversal of 689917780 is 87719986.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 27594 + ... + 46273.

It is an arithmetic number, because the mean of its divisors is an integer number (60497892).

Almost surely, 2^689917780 is an apocalyptic number.

It is an amenable number.

689917780 is an abundant number, since it is smaller than the sum of its proper divisors (762031628).

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

689917780 is a wasteful number, since it uses less digits than its factorization.

689917780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74343 (or 74341 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 689917780 is about 26266.2859955495. The cubic root of 689917780 is about 883.6204922168.

The spelling of 689917780 in words is "six hundred eighty-nine million, nine hundred seventeen thousand, seven hundred eighty".