642658716 has 108 divisors (see below), whose sum is σ = 1904043960. Its totient is φ = 182226240.

The previous prime is 642658699. The next prime is 642658727. The reversal of 642658716 is 617856246.

642658716 is a `hidden beast` number, since 64 + 2 + 6 + 587 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 243886 + ... + 246506.

Almost surely, 2^642658716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642658716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952021980).

642658716 is an abundant number, since it is smaller than the sum of its proper divisors (1261385244).

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

642658716 is a wasteful number, since it uses less digits than its factorization.

642658716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784 (or 2772 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 642658716 is about 25350.7143094628. The cubic root of 642658716 is about 862.9655669209.

The spelling of 642658716 in words is "six hundred forty-two million, six hundred fifty-eight thousand, seven hundred sixteen".