68777731 has 12 divisors (see below), whose sum is σ = 75813192. Its totient is φ = 62348000.

The previous prime is 68777719. The next prime is 68777741. The reversal of 68777731 is 13777786.

It is a de Polignac number, because none of the positive numbers 2^k-68777731 is a prime.

It is a super-2 number, since 2×68777731² = 9460752563016722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68777741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62496 + ... + 63586.

It is an arithmetic number, because the mean of its divisors is an integer number (6317766).

Almost surely, 2^68777731 is an apocalyptic number.

68777731 is a deficient number, since it is larger than the sum of its proper divisors (7035461).

68777731 is a wasteful number, since it uses less digits than its factorization.

68777731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1623 counting only the distinct ones).

The product of its digits is 345744, while the sum is 46.

The square root of 68777731 is about 8293.2340495129. The cubic root of 68777731 is about 409.7157081342.

Subtracting from 68777731 its reverse (13777786), we obtain a palindrome (54999945).

The spelling of 68777731 in words is "sixty-eight million, seven hundred seventy-seven thousand, seven hundred thirty-one".