642420880 has 40 divisors (see below), whose sum is σ = 1497082752. Its totient is φ = 256374144.

The previous prime is 642420859. The next prime is 642420901. The reversal of 642420880 is 88024246.

It is an interprime number because it is at equal distance from previous prime (642420859) and next prime (642420901).

It is a tau number, because it is divible by the number of its divisors (40).

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, 26377 + ... + 44503.

Almost surely, 2^642420880 is an apocalyptic number.

It is an amenable number.

642420880 is an abundant number, since it is smaller than the sum of its proper divisors (854661872).

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

642420880 is a wasteful number, since it uses less digits than its factorization.

642420880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18583 (or 18577 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 642420880 is about 25346.0229621927. The cubic root of 642420880 is about 862.8590979675.

The spelling of 642420880 in words is "six hundred forty-two million, four hundred twenty thousand, eight hundred eighty".