68428891 has 2 divisors, whose sum is σ = 68428892. Its totient is φ = 68428890.

The previous prime is 68428853. The next prime is 68428903. The reversal of 68428891 is 19882486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68428891 - 2⁹ = 68428379 is a prime.

It is not a weakly prime, because it can be changed into another prime (68428831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34214445 + 34214446.

It is an arithmetic number, because the mean of its divisors is an integer number (34214446).

Almost surely, 2^68428891 is an apocalyptic number.

68428891 is a deficient number, since it is larger than the sum of its proper divisors (1).

68428891 is an equidigital number, since it uses as much as digits as its factorization.

68428891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 46.

The square root of 68428891 is about 8272.1757113833. The cubic root of 68428891 is about 409.0218423184.

The spelling of 68428891 in words is "sixty-eight million, four hundred twenty-eight thousand, eight hundred ninety-one".