642743328 has 48 divisors (see below), whose sum is σ = 1712400480. Its totient is φ = 211047936.

The previous prime is 642743291. The next prime is 642743341. The reversal of 642743328 is 823347246.

It is a tau number, because it is divible by the number of its divisors (48).

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, 43533 + ... + 56396.

It is an arithmetic number, because the mean of its divisors is an integer number (35675010).

Almost surely, 2^642743328 is an apocalyptic number.

It is an amenable number.

642743328 is an abundant number, since it is smaller than the sum of its proper divisors (1069657152).

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

642743328 is a wasteful number, since it uses less digits than its factorization.

642743328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100009 (or 100001 counting only the distinct ones).

The product of its digits is 193536, while the sum is 39.

The square root of 642743328 is about 25352.3830832527. The cubic root of 642743328 is about 863.0034377413.

The spelling of 642743328 in words is "six hundred forty-two million, seven hundred forty-three thousand, three hundred twenty-eight".