68509791 has 24 divisors (see below), whose sum is σ = 115408800. Its totient is φ = 39146688.

The previous prime is 68509787. The next prime is 68509823. The reversal of 68509791 is 19790586.

It is not a de Polignac number, because 68509791 - 2² = 68509787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68509591) 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, 8010 + ... + 14183.

It is an arithmetic number, because the mean of its divisors is an integer number (4808700).

Almost surely, 2^68509791 is an apocalyptic number.

68509791 is a deficient number, since it is larger than the sum of its proper divisors (46899009).

68509791 is a wasteful number, since it uses less digits than its factorization.

68509791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22220 (or 22203 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 68509791 is about 8277.0641534302. The cubic root of 68509791 is about 409.1829674171.

It can be divided in two parts, 6850 and 9791, that added together give a square (16641 = 129²).

The spelling of 68509791 in words is "sixty-eight million, five hundred nine thousand, seven hundred ninety-one".