68688451 has 8 divisors (see below), whose sum is σ = 74042640. Its totient is φ = 63344352.

The previous prime is 68688437. The next prime is 68688463. The reversal of 68688451 is 15488686.

68688451 = 3381² + 3382² + ... + 3386².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68688451 - 2²¹ = 66591299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68688251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17640 + ... + 21178.

It is an arithmetic number, because the mean of its divisors is an integer number (9255330).

Almost surely, 2^68688451 is an apocalyptic number.

68688451 is a deficient number, since it is larger than the sum of its proper divisors (5354189).

68688451 is a wasteful number, since it uses less digits than its factorization.

68688451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045.

The product of its digits is 368640, while the sum is 46.

The square root of 68688451 is about 8287.8496004694. The cubic root of 68688451 is about 409.5383481217.

The spelling of 68688451 in words is "sixty-eight million, six hundred eighty-eight thousand, four hundred fifty-one".