639148622 has 16 divisors (see below), whose sum is σ = 1099732992. Its totient is φ = 272908440.

The previous prime is 639148621. The next prime is 639148637. The reversal of 639148622 is 226841936.

It is a super-2 number, since 2×639148622² = 817021922008997768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639148622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639148621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80438 + ... + 88025.

It is an arithmetic number, because the mean of its divisors is an integer number (68733312).

Almost surely, 2^639148622 is an apocalyptic number.

639148622 is a deficient number, since it is larger than the sum of its proper divisors (460584370).

639148622 is a wasteful number, since it uses less digits than its factorization.

639148622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168743.

The product of its digits is 124416, while the sum is 41.

The square root of 639148622 is about 25281.3888463431. The cubic root of 639148622 is about 861.3915734610.

The spelling of 639148622 in words is "six hundred thirty-nine million, one hundred forty-eight thousand, six hundred twenty-two".