68642990 has 32 divisors (see below), whose sum is σ = 137362176. Its totient is φ = 24526080.

The previous prime is 68642947. The next prime is 68642993. The reversal of 68642990 is 9924686.

It is a super-2 number, since 2×68642990² = 9423720152280200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68642993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4487 + ... + 12546.

It is an arithmetic number, because the mean of its divisors is an integer number (4292568).

Almost surely, 2^68642990 is an apocalyptic number.

68642990 is an abundant number, since it is smaller than the sum of its proper divisors (68719186).

68642990 is a wasteful number, since it uses less digits than its factorization.

68642990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17084.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 68642990 is about 8285.1065171185. The cubic root of 68642990 is about 409.4479780935.

The spelling of 68642990 in words is "sixty-eight million, six hundred forty-two thousand, nine hundred ninety".