68721894 has 24 divisors (see below), whose sum is σ = 150997392. Its totient is φ = 22584240.

The previous prime is 68721847. The next prime is 68721923. The reversal of 68721894 is 49812786.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25609 + ... + 28164.

It is an arithmetic number, because the mean of its divisors is an integer number (6291558).

Almost surely, 2^68721894 is an apocalyptic number.

68721894 is an abundant number, since it is smaller than the sum of its proper divisors (82275498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68721894 is a wasteful number, since it uses less digits than its factorization.

68721894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53852 (or 53849 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 68721894 is about 8289.8669470625. The cubic root of 68721894 is about 409.6048026158.

The spelling of 68721894 in words is "sixty-eight million, seven hundred twenty-one thousand, eight hundred ninety-four".