642998916 has 108 divisors (see below), whose sum is σ = 1905251712. Its totient is φ = 179033472.

The previous prime is 642998911. The next prime is 642998927. The reversal of 642998916 is 619899246.

It is not an unprimeable number, because it can be changed into a prime (642998911) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2759536 + ... + 2759768.

Almost surely, 2^642998916 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 642998916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952625856).

642998916 is an abundant number, since it is smaller than the sum of its proper divisors (1262252796).

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

642998916 is a wasteful number, since it uses less digits than its factorization.

642998916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 292 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 642998916 is about 25357.4232918094. The cubic root of 642998916 is about 863.1178141869.

The spelling of 642998916 in words is "six hundred forty-two million, nine hundred ninety-eight thousand, nine hundred sixteen".