68999631 has 4 divisors (see below), whose sum is σ = 91999512. Its totient is φ = 45999752.

The previous prime is 68999629. The next prime is 68999647. The reversal of 68999631 is 13699986.

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 68999631 - 2¹ = 68999629 is a prime.

It is a super-2 number, since 2×68999631² = 9521898156272322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68999611) 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, 11499936 + ... + 11499941.

It is an arithmetic number, because the mean of its divisors is an integer number (22999878).

Almost surely, 2^68999631 is an apocalyptic number.

68999631 is a deficient number, since it is larger than the sum of its proper divisors (22999881).

68999631 is a wasteful number, since it uses less digits than its factorization.

68999631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22999880.

The product of its digits is 629856, while the sum is 51.

The square root of 68999631 is about 8306.6016516985. The cubic root of 68999631 is about 410.1558618202.

The spelling of 68999631 in words is "sixty-eight million, nine hundred ninety-nine thousand, six hundred thirty-one".