68624657 has 4 divisors (see below), whose sum is σ = 68801460. Its totient is φ = 68447856.

The previous prime is 68624641. The next prime is 68624671. The reversal of 68624657 is 75642686.

It is a Cunningham number, because it is equal to 8284²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16192576 + 52432081 = 4024^2 + 7241^2 .

It is a cyclic number.

It is not a de Polignac number, because 68624657 - 2⁴ = 68624641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68624627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87818 + ... + 88595.

It is an arithmetic number, because the mean of its divisors is an integer number (17200365).

Almost surely, 2^68624657 is an apocalyptic number.

It is an amenable number.

68624657 is a deficient number, since it is larger than the sum of its proper divisors (176803).

68624657 is a wasteful number, since it uses less digits than its factorization.

68624657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176802.

The product of its digits is 483840, while the sum is 44.

The square root of 68624657 is about 8284.0000603573. Note that the first 4 decimals coincide. The cubic root of 68624657 is about 409.4115233968.

The spelling of 68624657 in words is "sixty-eight million, six hundred twenty-four thousand, six hundred fifty-seven".