68619631 has 4 divisors (see below), whose sum is σ = 68968152. Its totient is φ = 68271112.

The previous prime is 68619611. The next prime is 68619641. The reversal of 68619631 is 13691686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13691686 = 2 ⋅6845843.

It is a cyclic number.

It is not a de Polignac number, because 68619631 - 2¹⁹ = 68095343 is a prime.

It is a super-2 number, since 2×68619631² = 9417307517152322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68619611) 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, 173965 + ... + 174358.

It is an arithmetic number, because the mean of its divisors is an integer number (17242038).

Almost surely, 2^68619631 is an apocalyptic number.

68619631 is a deficient number, since it is larger than the sum of its proper divisors (348521).

68619631 is a wasteful number, since it uses less digits than its factorization.

68619631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348520.

The product of its digits is 46656, while the sum is 40.

The square root of 68619631 is about 8283.6966989382. The cubic root of 68619631 is about 409.4015281917.

The spelling of 68619631 in words is "sixty-eight million, six hundred nineteen thousand, six hundred thirty-one".