68694921 has 12 divisors (see below), whose sum is σ = 99326448. Its totient is φ = 45750264.

The previous prime is 68694919. The next prime is 68694931. The reversal of 68694921 is 12949686.

It is a happy number.

It is not a de Polignac number, because 68694921 - 2¹ = 68694919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68694911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7186 + ... + 13748.

It is an arithmetic number, because the mean of its divisors is an integer number (8277204).

Almost surely, 2^68694921 is an apocalyptic number.

It is an amenable number.

68694921 is a deficient number, since it is larger than the sum of its proper divisors (30631527).

68694921 is a wasteful number, since it uses less digits than its factorization.

68694921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7732 (or 7729 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 68694921 is about 8288.2399217204. The cubic root of 68694921 is about 409.5512063236.

The spelling of 68694921 in words is "sixty-eight million, six hundred ninety-four thousand, nine hundred twenty-one".