68631357 has 4 divisors (see below), whose sum is σ = 91508480. Its totient is φ = 45754236.

The previous prime is 68631331. The next prime is 68631359. The reversal of 68631357 is 75313686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68631357 - 2¹⁰ = 68630333 is a prime.

It is a super-2 number, since 2×68631357² = 9420526327322898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68631359) 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, 11438557 + ... + 11438562.

It is an arithmetic number, because the mean of its divisors is an integer number (22877120).

Almost surely, 2^68631357 is an apocalyptic number.

It is an amenable number.

68631357 is a deficient number, since it is larger than the sum of its proper divisors (22877123).

68631357 is a wasteful number, since it uses less digits than its factorization.

68631357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22877122.

The product of its digits is 90720, while the sum is 39.

The square root of 68631357 is about 8284.4044444969. The cubic root of 68631357 is about 409.4248469264.

The spelling of 68631357 in words is "sixty-eight million, six hundred thirty-one thousand, three hundred fifty-seven".