687791016 has 48 divisors (see below), whose sum is σ = 2032112160. Its totient is φ = 208421280.

The previous prime is 687791009. The next prime is 687791023. The reversal of 687791016 is 610197786.

It is an interprime number because it is at equal distance from previous prime (687791009) and next prime (687791023).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433420 + ... + 435003.

It is an arithmetic number, because the mean of its divisors is an integer number (42335670).

Almost surely, 2^687791016 is an apocalyptic number.

687791016 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

687791016 is an abundant number, since it is smaller than the sum of its proper divisors (1344321144).

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

687791016 is a wasteful number, since it uses less digits than its factorization.

687791016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868446 (or 868439 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 687791016 is about 26225.7700744897. The cubic root of 687791016 is about 882.7115981251.

The spelling of 687791016 in words is "six hundred eighty-seven million, seven hundred ninety-one thousand, sixteen".