642748984 has 32 divisors (see below), whose sum is σ = 1259089920. Its totient is φ = 307026016.

The previous prime is 642748963. The next prime is 642748991. The reversal of 642748984 is 489847246.

It is a congruent number.

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, 201369 + ... + 204535.

It is an arithmetic number, because the mean of its divisors is an integer number (39346560).

Almost surely, 2^642748984 is an apocalyptic number.

It is an amenable number.

642748984 is a deficient number, since it is larger than the sum of its proper divisors (616340936).

642748984 is a wasteful number, since it uses less digits than its factorization.

642748984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299 (or 4295 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 52.

The square root of 642748984 is about 25352.4946307065. The cubic root of 642748984 is about 863.0059691474.

The spelling of 642748984 in words is "six hundred forty-two million, seven hundred forty-eight thousand, nine hundred eighty-four".