68722690 has 16 divisors (see below), whose sum is σ = 127044792. Its totient is φ = 26745984.

The previous prime is 68722681. The next prime is 68722697. The reversal of 68722690 is 9622786.

It can be written as a sum of positive squares in 4 ways, for example, as 50651689 + 18071001 = 7117^2 + 4251^2 .

It is a super-2 number, since 2×68722690² = 9445616241672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68722697) 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, 92499 + ... + 93238.

Almost surely, 2^68722690 is an apocalyptic number.

68722690 is a deficient number, since it is larger than the sum of its proper divisors (58322102).

68722690 is a wasteful number, since it uses less digits than its factorization.

68722690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185781.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 68722690 is about 8289.9149573443. The cubic root of 68722690 is about 409.6063840825.

The spelling of 68722690 in words is "sixty-eight million, seven hundred twenty-two thousand, six hundred ninety".