68931387 has 18 divisors (see below), whose sum is σ = 115824228. Its totient is φ = 39389112.

The previous prime is 68931367. The next prime is 68931397. The reversal of 68931387 is 78313986.

It is a happy number.

It is not a de Polignac number, because 68931387 - 2¹⁴ = 68915003 is a prime.

It is a super-2 number, since 2×68931387² = 9503072227487538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68931337) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 77713 + ... + 78594.

Almost surely, 2^68931387 is an apocalyptic number.

68931387 is a deficient number, since it is larger than the sum of its proper divisors (46892841).

68931387 is a wasteful number, since it uses less digits than its factorization.

68931387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156327 (or 156317 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 68931387 is about 8302.4928184251. The cubic root of 68931387 is about 410.0205958323.

The spelling of 68931387 in words is "sixty-eight million, nine hundred thirty-one thousand, three hundred eighty-seven".