68553891 has 24 divisors (see below), whose sum is σ = 118145040. Its totient is φ = 39172896.

The previous prime is 68553839. The next prime is 68553913. The reversal of 68553891 is 19835586.

68553891 is a `hidden beast` number, since 6 + 8 + 553 + 8 + 91 = 666.

It is not a de Polignac number, because 68553891 - 2⁹ = 68553379 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (259200) is a multiple of the sum of its prime factors (51840).

It is not an unprimeable number, because it can be changed into a prime (68553091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24586 + ... + 27231.

It is an arithmetic number, because the mean of its divisors is an integer number (4922710).

Almost surely, 2^68553891 is an apocalyptic number.

68553891 is a deficient number, since it is larger than the sum of its proper divisors (49591149).

68553891 is a wasteful number, since it uses less digits than its factorization.

68553891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51840 (or 51827 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 68553891 is about 8279.7277129142. The cubic root of 68553891 is about 409.2707461035.

The spelling of 68553891 in words is "sixty-eight million, five hundred fifty-three thousand, eight hundred ninety-one".