686947632 has 40 divisors (see below), whose sum is σ = 2028132096. Its totient is φ = 196270656.

The previous prime is 686947619. The next prime is 686947669. The reversal of 686947632 is 236749686.

It is a happy number.

It is a super-2 number, since 2×686947632² = 943794098220814848, which contains 22 as substring.

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, 1021908 + ... + 1022579.

Almost surely, 2^686947632 is an apocalyptic number.

It is an amenable number.

686947632 is an abundant number, since it is smaller than the sum of its proper divisors (1341184464).

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

686947632 is a wasteful number, since it uses less digits than its factorization.

686947632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044505 (or 2044499 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The square root of 686947632 is about 26209.6858432145. The cubic root of 686947632 is about 882.3506506273.

The spelling of 686947632 in words is "six hundred eighty-six million, nine hundred forty-seven thousand, six hundred thirty-two".