687420752 has 10 divisors (see below), whose sum is σ = 1331877738. Its totient is φ = 343710368.

The previous prime is 687420689. The next prime is 687420761. The reversal of 687420752 is 257024786.

It can be written as a sum of positive squares in only one way, i.e., 663371536 + 24049216 = 25756^2 + 4904^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21481883 + ... + 21481914.

Almost surely, 2^687420752 is an apocalyptic number.

It is an amenable number.

687420752 is a deficient number, since it is larger than the sum of its proper divisors (644456986).

687420752 is a wasteful number, since it uses less digits than its factorization.

687420752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42963805 (or 42963799 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 687420752 is about 26218.7099606369. The cubic root of 687420752 is about 882.5531706442.

The spelling of 687420752 in words is "six hundred eighty-seven million, four hundred twenty thousand, seven hundred fifty-two".