687107940 has 24 divisors (see below), whose sum is σ = 1923902400. Its totient is φ = 183228768.

The previous prime is 687107903. The next prime is 687107977. The reversal of 687107940 is 49701786.

It is an interprime number because it is at equal distance from previous prime (687107903) and next prime (687107977).

It is a super-2 number, since 2×687107940² = 944234642422087200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 687107892 and 687107901.

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, 5725840 + ... + 5725959.

It is an arithmetic number, because the mean of its divisors is an integer number (80162600).

Almost surely, 2^687107940 is an apocalyptic number.

687107940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687107940 is an abundant number, since it is smaller than the sum of its proper divisors (1236794460).

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

687107940 is a wasteful number, since it uses less digits than its factorization.

687107940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11451811 (or 11451809 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 687107940 is about 26212.7438472206. The cubic root of 687107940 is about 882.4192812186.

The spelling of 687107940 in words is "six hundred eighty-seven million, one hundred seven thousand, nine hundred forty".