687401577 has 24 divisors (see below), whose sum is σ = 1022206536. Its totient is φ = 444807936.

The previous prime is 687401567. The next prime is 687401581. The reversal of 687401577 is 775104786.

687401577 is a `hidden beast` number, since 6 + 8 + 74 + 0 + 1 + 577 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 137452176 + 549949401 = 11724^2 + 23451^2 .

It is not a de Polignac number, because 687401577 - 2⁸ = 687401321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687401567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149923 + ... + 154439.

It is an arithmetic number, because the mean of its divisors is an integer number (42591939).

Almost surely, 2^687401577 is an apocalyptic number.

It is an amenable number.

687401577 is a deficient number, since it is larger than the sum of its proper divisors (334804959).

687401577 is a wasteful number, since it uses less digits than its factorization.

687401577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017 (or 5014 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 687401577 is about 26218.3442841076. The cubic root of 687401577 is about 882.5449645519.

The spelling of 687401577 in words is "six hundred eighty-seven million, four hundred one thousand, five hundred seventy-seven".