68181916 has 24 divisors (see below), whose sum is σ = 130386816. Its totient is φ = 30939120.

The previous prime is 68181887. The next prime is 68181923. The reversal of 68181916 is 61918186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38155 + ... + 39901.

It is an arithmetic number, because the mean of its divisors is an integer number (5432784).

Almost surely, 2^68181916 is an apocalyptic number.

It is an amenable number.

68181916 is a deficient number, since it is larger than the sum of its proper divisors (62204900).

68181916 is a wasteful number, since it uses less digits than its factorization.

68181916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649 (or 2647 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 68181916 is about 8257.2341616306. The cubic root of 68181916 is about 408.5291656892.

The spelling of 68181916 in words is "sixty-eight million, one hundred eighty-one thousand, nine hundred sixteen".