687777066 has 24 divisors (see below), whose sum is σ = 1495281060. Its totient is φ = 228474816.

The previous prime is 687777059. The next prime is 687777113. The reversal of 687777066 is 660777786.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 589469841 + 98307225 = 24279^2 + 9915^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59931 + ... + 70478.

Almost surely, 2^687777066 is an apocalyptic number.

687777066 is an abundant number, since it is smaller than the sum of its proper divisors (807503994).

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

687777066 is a wasteful number, since it uses less digits than its factorization.

687777066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130710 (or 130707 counting only the distinct ones).

The product of its (nonzero) digits is 4148928, while the sum is 54.

The square root of 687777066 is about 26225.5041133626. The cubic root of 687777066 is about 882.7056302707.

The spelling of 687777066 in words is "six hundred eighty-seven million, seven hundred seventy-seven thousand, sixty-six".