688780072 has 16 divisors (see below), whose sum is σ = 1333123200. Its totient is φ = 333280560.

The previous prime is 688780069. The next prime is 688780093. The reversal of 688780072 is 270087886.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388422 + ... + 1388917.

It is an arithmetic number, because the mean of its divisors is an integer number (83320200).

Almost surely, 2^688780072 is an apocalyptic number.

688780072 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

688780072 is a deficient number, since it is larger than the sum of its proper divisors (644343128).

688780072 is a wasteful number, since it uses less digits than its factorization.

688780072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777376 (or 2777372 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 688780072 is about 26244.6198676986. The cubic root of 688780072 is about 883.1345139180.

The spelling of 688780072 in words is "six hundred eighty-eight million, seven hundred eighty thousand, seventy-two".