68881731 has 4 divisors (see below), whose sum is σ = 91842312. Its totient is φ = 45921152.

The previous prime is 68881723. The next prime is 68881751. The reversal of 68881731 is 13718886.

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

It is a cyclic number.

It is not a de Polignac number, because 68881731 - 2³ = 68881723 is a prime.

It is a super-2 number, since 2×68881731² = 9489385731112722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68881751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11480286 + ... + 11480291.

It is an arithmetic number, because the mean of its divisors is an integer number (22960578).

Almost surely, 2^68881731 is an apocalyptic number.

68881731 is a deficient number, since it is larger than the sum of its proper divisors (22960581).

68881731 is a wasteful number, since it uses less digits than its factorization.

68881731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22960580.

The product of its digits is 64512, while the sum is 42.

The square root of 68881731 is about 8299.5018525210. The cubic root of 68881731 is about 409.9221168740.

The spelling of 68881731 in words is "sixty-eight million, eight hundred eighty-one thousand, seven hundred thirty-one".