687546639144 has 24 divisors (see below), whose sum is σ = 1862105481210. Its totient is φ = 229182213024.

The previous prime is 687546639127. The next prime is 687546639173. The reversal of 687546639144 is 441936645786.

687546639144 is a `hidden beast` number, since 6 + 87 + 5 + 466 + 3 + 91 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 666590602500 + 20956036644 = 816450^2 + 144762^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-4 number, since 4×687546639144⁴ (a number of 48 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4774629367 + ... + 4774629510.

Almost surely, 2^687546639144 is an apocalyptic number.

It is an amenable number.

687546639144 is an abundant number, since it is smaller than the sum of its proper divisors (1174558842066).

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

687546639144 is a wasteful number, since it uses less digits than its factorization.

687546639144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549258889 (or 9549258882 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 63.

The spelling of 687546639144 in words is "six hundred eighty-seven billion, five hundred forty-six million, six hundred thirty-nine thousand, one hundred forty-four".