687147840 has 112 divisors (see below), whose sum is σ = 2424135360. Its totient is φ = 183237120.

The previous prime is 687147833. The next prime is 687147889. The reversal of 687147840 is 48741786.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31126 + ... + 48405.

Almost surely, 2^687147840 is an apocalyptic number.

687147840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687147840 is an abundant number, since it is smaller than the sum of its proper divisors (1736987520).

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

687147840 is a wasteful number, since it uses less digits than its factorization.

687147840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79557 (or 79541 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 687147840 is about 26213.5049163594. The cubic root of 687147840 is about 882.4363614306.

The spelling of 687147840 in words is "six hundred eighty-seven million, one hundred forty-seven thousand, eight hundred forty".