68213631 has 4 divisors (see below), whose sum is σ = 90951512. Its totient is φ = 45475752.

The previous prime is 68213611. The next prime is 68213641. The reversal of 68213631 is 13631286.

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

It is not a de Polignac number, because 68213631 - 2⁶ = 68213567 is a prime.

It is a super-2 number, since 2×68213631² = 9306198908408322, 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 (68213611) 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, 11368936 + ... + 11368941.

It is an arithmetic number, because the mean of its divisors is an integer number (22737878).

Almost surely, 2^68213631 is an apocalyptic number.

68213631 is a deficient number, since it is larger than the sum of its proper divisors (22737881).

68213631 is a wasteful number, since it uses less digits than its factorization.

68213631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22737880.

The product of its digits is 5184, while the sum is 30.

The square root of 68213631 is about 8259.1543756004. The cubic root of 68213631 is about 408.5924986805.

The spelling of 68213631 in words is "sixty-eight million, two hundred thirteen thousand, six hundred thirty-one".