68181642 has 16 divisors (see below), whose sum is σ = 151514880. Its totient is φ = 22727196.

The previous prime is 68181613. The next prime is 68181643. The reversal of 68181642 is 24618186.

68181642 is a `hidden beast` number, since 6 + 8 + 1 + 8 + 1 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 68181597 and 68181606.

It is not an unprimeable number, because it can be changed into a prime (68181643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631258 + ... + 631365.

It is an arithmetic number, because the mean of its divisors is an integer number (9469680).

Almost surely, 2^68181642 is an apocalyptic number.

68181642 is an abundant number, since it is smaller than the sum of its proper divisors (83333238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68181642 is a wasteful number, since it uses less digits than its factorization.

68181642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262634 (or 1262628 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 68181642 is about 8257.2175701019. The cubic root of 68181642 is about 408.5286184417.

The spelling of 68181642 in words is "sixty-eight million, one hundred eighty-one thousand, six hundred forty-two".