639170490 has 64 divisors (see below), whose sum is σ = 1793949696. Its totient is φ = 142696512.

The previous prime is 639170489. The next prime is 639170491. The reversal of 639170490 is 94071936.

It is an interprime number because it is at equal distance from previous prime (639170489) and next prime (639170491).

It is not an unprimeable number, because it can be changed into a prime (639170491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26362 + ... + 44421.

It is an arithmetic number, because the mean of its divisors is an integer number (28030464).

Almost surely, 2^639170490 is an apocalyptic number.

639170490 is an abundant number, since it is smaller than the sum of its proper divisors (1154779206).

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

639170490 is a wasteful number, since it uses less digits than its factorization.

639170490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70843.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 639170490 is about 25281.8213347061. The cubic root of 639170490 is about 861.4013973087.

The spelling of 639170490 in words is "six hundred thirty-nine million, one hundred seventy thousand, four hundred ninety".