639967083 has 16 divisors (see below), whose sum is σ = 980299776. Its totient is φ = 363778560.

The previous prime is 639967079. The next prime is 639967117. The reversal of 639967083 is 380769936.

It is a happy number.

It is not a de Polignac number, because 639967083 - 2² = 639967079 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639967033) 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, 75766 + ... + 83787.

It is an arithmetic number, because the mean of its divisors is an integer number (61268736).

Almost surely, 2^639967083 is an apocalyptic number.

639967083 is a deficient number, since it is larger than the sum of its proper divisors (340332693).

639967083 is a wasteful number, since it uses less digits than its factorization.

639967083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159754.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 639967083 is about 25297.5706936457. The cubic root of 639967083 is about 861.7591012747.

The spelling of 639967083 in words is "six hundred thirty-nine million, nine hundred sixty-seven thousand, eighty-three".