687242064 has 20 divisors (see below), whose sum is σ = 1775375456. Its totient is φ = 229080672.

The previous prime is 687242009. The next prime is 687242071. The reversal of 687242064 is 460242786.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7158724 + ... + 7158819.

Almost surely, 2^687242064 is an apocalyptic number.

It is an amenable number.

687242064 is an abundant number, since it is smaller than the sum of its proper divisors (1088133392).

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

687242064 is a wasteful number, since it uses less digits than its factorization.

687242064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14317554 (or 14317548 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 687242064 is about 26215.3020962948. The cubic root of 687242064 is about 882.4766937913.

The spelling of 687242064 in words is "six hundred eighty-seven million, two hundred forty-two thousand, sixty-four".