688783980 has 24 divisors (see below), whose sum is σ = 1928595312. Its totient is φ = 183675712.

The previous prime is 688783961. The next prime is 688783987. The reversal of 688783980 is 89387886.

It is a super-2 number, since 2×688783980² = 948846742209280800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 688783980.

It is not an unprimeable number, because it can be changed into a prime (688783987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5739807 + ... + 5739926.

It is an arithmetic number, because the mean of its divisors is an integer number (80358138).

Almost surely, 2^688783980 is an apocalyptic number.

688783980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688783980 is an abundant number, since it is smaller than the sum of its proper divisors (1239811332).

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

688783980 is a wasteful number, since it uses less digits than its factorization.

688783980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11479745 (or 11479743 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The square root of 688783980 is about 26244.6943209480. The cubic root of 688783980 is about 883.1361841575.

The spelling of 688783980 in words is "six hundred eighty-eight million, seven hundred eighty-three thousand, nine hundred eighty".