641878732 has 24 divisors (see below), whose sum is σ = 1226791440. Its totient is φ = 291432960.

The previous prime is 641878723. The next prime is 641878747. The reversal of 641878732 is 237878146.

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, 33444 + ... + 49012.

It is an arithmetic number, because the mean of its divisors is an integer number (51116310).

Almost surely, 2^641878732 is an apocalyptic number.

It is an amenable number.

641878732 is a deficient number, since it is larger than the sum of its proper divisors (584912708).

641878732 is a wasteful number, since it uses less digits than its factorization.

641878732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16521 (or 16519 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 641878732 is about 25335.3257725256. The cubic root of 641878732 is about 862.6163033530.

The spelling of 641878732 in words is "six hundred forty-one million, eight hundred seventy-eight thousand, seven hundred thirty-two".