639376332 has 48 divisors (see below), whose sum is σ = 1706245632. Its totient is φ = 182545920.

The previous prime is 639376321. The next prime is 639376337. The reversal of 639376332 is 233673936.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (639376337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208732 + ... + 211772.

It is an arithmetic number, because the mean of its divisors is an integer number (35546784).

Almost surely, 2^639376332 is an apocalyptic number.

It is an amenable number.

639376332 is an abundant number, since it is smaller than the sum of its proper divisors (1066869300).

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

639376332 is a wasteful number, since it uses less digits than its factorization.

639376332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558 (or 5556 counting only the distinct ones).

The product of its digits is 367416, while the sum is 42.

The square root of 639376332 is about 25285.8919557923. The cubic root of 639376332 is about 861.4938575408.

The spelling of 639376332 in words is "six hundred thirty-nine million, three hundred seventy-six thousand, three hundred thirty-two".