642506980 has 24 divisors (see below), whose sum is σ = 1350268920. Its totient is φ = 256811520.

The previous prime is 642506947. The next prime is 642507011. The reversal of 642506980 is 89605246.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34292736 + 608214244 = 5856^2 + 24662^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17340 + ... + 39820.

It is an arithmetic number, because the mean of its divisors is an integer number (56261205).

Almost surely, 2^642506980 is an apocalyptic number.

It is an amenable number.

642506980 is an abundant number, since it is smaller than the sum of its proper divisors (707761940).

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

642506980 is a wasteful number, since it uses less digits than its factorization.

642506980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23919 (or 23917 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 642506980 is about 25347.7213966068. The cubic root of 642506980 is about 862.8976442704.

The spelling of 642506980 in words is "six hundred forty-two million, five hundred six thousand, nine hundred eighty".