68645913 has 24 divisors (see below), whose sum is σ = 107338752. Its totient is φ = 38906784.

The previous prime is 68645909. The next prime is 68645977. The reversal of 68645913 is 31954686.

It is not a de Polignac number, because 68645913 - 2² = 68645909 is a prime.

It is a super-2 number, since 2×68645913² = 9424522743207138, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68645713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16831 + ... + 20507.

It is an arithmetic number, because the mean of its divisors is an integer number (4472448).

Almost surely, 2^68645913 is an apocalyptic number.

It is an amenable number.

68645913 is a deficient number, since it is larger than the sum of its proper divisors (38692839).

68645913 is a wasteful number, since it uses less digits than its factorization.

68645913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821 (or 3814 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 68645913 is about 8285.2829161110. The cubic root of 68645913 is about 409.4537898035.

The spelling of 68645913 in words is "sixty-eight million, six hundred forty-five thousand, nine hundred thirteen".