639368290 has 32 divisors (see below), whose sum is σ = 1284693696. Its totient is φ = 227088960.

The previous prime is 639368269. The next prime is 639368291. The reversal of 639368290 is 92863936.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 639368290.

It is not an unprimeable number, because it can be changed into a prime (639368291) 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, 62857 + ... + 72316.

It is an arithmetic number, because the mean of its divisors is an integer number (40146678).

Almost surely, 2^639368290 is an apocalyptic number.

639368290 is an abundant number, since it is smaller than the sum of its proper divisors (645325406).

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

639368290 is a wasteful number, since it uses less digits than its factorization.

639368290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135234.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 639368290 is about 25285.7329338107. The cubic root of 639368290 is about 861.4902456030.

The spelling of 639368290 in words is "six hundred thirty-nine million, three hundred sixty-eight thousand, two hundred ninety".