68742091 has 4 divisors (see below), whose sum is σ = 74991384. Its totient is φ = 62492800.

The previous prime is 68742083. The next prime is 68742127. The reversal of 68742091 is 19024786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68742091 - 2³ = 68742083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68742091.

It is not an unprimeable number, because it can be changed into a prime (68742031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124630 + ... + 3124651.

It is an arithmetic number, because the mean of its divisors is an integer number (18747846).

Almost surely, 2^68742091 is an apocalyptic number.

68742091 is a deficient number, since it is larger than the sum of its proper divisors (6249293).

68742091 is a wasteful number, since it uses less digits than its factorization.

68742091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249292.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 68742091 is about 8291.0850315263. The cubic root of 68742091 is about 409.6449255781.

It can be divided in two parts, 687 and 42091, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 68742091 in words is "sixty-eight million, seven hundred forty-two thousand, ninety-one".