687786144 has 48 divisors (see below), whose sum is σ = 1830189312. Its totient is φ = 226119168.

The previous prime is 687786137. The next prime is 687786179. The reversal of 687786144 is 441687786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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, 42064 + ... + 56079.

It is an arithmetic number, because the mean of its divisors is an integer number (38128944).

Almost surely, 2^687786144 is an apocalyptic number.

It is an amenable number.

687786144 is an abundant number, since it is smaller than the sum of its proper divisors (1142403168).

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

687786144 is a wasteful number, since it uses less digits than its factorization.

687786144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98229 (or 98221 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 51.

The square root of 687786144 is about 26225.6771885875. The cubic root of 687786144 is about 882.7095138772.

The spelling of 687786144 in words is "six hundred eighty-seven million, seven hundred eighty-six thousand, one hundred forty-four".