68639620 has 24 divisors (see below), whose sum is σ = 164735424. Its totient is φ = 23533536.

The previous prime is 68639587. The next prime is 68639621. The reversal of 68639620 is 2693686.

It is a super-2 number, since 2×68639620² = 9422794867488800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (68639621) 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, 245002 + ... + 245281.

It is an arithmetic number, because the mean of its divisors is an integer number (6863976).

Almost surely, 2^68639620 is an apocalyptic number.

It is an amenable number.

68639620 is an abundant number, since it is smaller than the sum of its proper divisors (96095804).

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

68639620 is a wasteful number, since it uses less digits than its factorization.

68639620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490299 (or 490297 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 68639620 is about 8284.9031376353. The cubic root of 68639620 is about 409.4412774225.

The spelling of 68639620 in words is "sixty-eight million, six hundred thirty-nine thousand, six hundred twenty".