642009476 has 6 divisors (see below), whose sum is σ = 1123516590. Its totient is φ = 321004736.

The previous prime is 642009469. The next prime is 642009481. The reversal of 642009476 is 674900246.

It can be written as a sum of positive squares in only one way, i.e., 627001600 + 15007876 = 25040^2 + 3874^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80251181 + ... + 80251188.

It is an arithmetic number, because the mean of its divisors is an integer number (187252765).

Almost surely, 2^642009476 is an apocalyptic number.

It is an amenable number.

642009476 is a deficient number, since it is larger than the sum of its proper divisors (481507114).

642009476 is a wasteful number, since it uses less digits than its factorization.

642009476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160502373 (or 160502371 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 642009476 is about 25337.9059118941. The cubic root of 642009476 is about 862.6748680236.

The spelling of 642009476 in words is "six hundred forty-two million, nine thousand, four hundred seventy-six".