642409312 has 24 divisors (see below), whose sum is σ = 1265341392. Its totient is φ = 321052800.

The previous prime is 642409309. The next prime is 642409331. The reversal of 642409312 is 213904246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98637 + ... + 104947.

It is an arithmetic number, because the mean of its divisors is an integer number (52722558).

Almost surely, 2^642409312 is an apocalyptic number.

It is an amenable number.

642409312 is a deficient number, since it is larger than the sum of its proper divisors (622932080).

642409312 is a wasteful number, since it uses less digits than its factorization.

642409312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502 (or 9494 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 642409312 is about 25345.7947596835. The cubic root of 642409312 is about 862.8539188010.

The spelling of 642409312 in words is "six hundred forty-two million, four hundred nine thousand, three hundred twelve".