68749391 has 16 divisors (see below), whose sum is σ = 74511360. Its totient is φ = 63226080.

The previous prime is 68749363. The next prime is 68749403. The reversal of 68749391 is 19394786.

It is a cyclic number.

It is not a de Polignac number, because 68749391 - 2⁶ = 68749327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68749301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148901 + ... + 149361.

It is an arithmetic number, because the mean of its divisors is an integer number (4656960).

Almost surely, 2^68749391 is an apocalyptic number.

68749391 is a deficient number, since it is larger than the sum of its proper divisors (5761969).

68749391 is a wasteful number, since it uses less digits than its factorization.

68749391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its digits is 326592, while the sum is 47.

The square root of 68749391 is about 8291.5252517254. The cubic root of 68749391 is about 409.6594256806.

The spelling of 68749391 in words is "sixty-eight million, seven hundred forty-nine thousand, three hundred ninety-one".