687320378 has 4 divisors (see below), whose sum is σ = 1030980570. Its totient is φ = 343660188.

The previous prime is 687320363. The next prime is 687320401. The reversal of 687320378 is 873023786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 560600329 + 126720049 = 23677^2 + 11257^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171830093 + ... + 171830096.

Almost surely, 2^687320378 is an apocalyptic number.

687320378 is a deficient number, since it is larger than the sum of its proper divisors (343660192).

687320378 is a wasteful number, since it uses less digits than its factorization.

687320378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343660191.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 687320378 is about 26216.7957233526. The cubic root of 687320378 is about 882.5102131088.

The spelling of 687320378 in words is "six hundred eighty-seven million, three hundred twenty thousand, three hundred seventy-eight".