68521315 has 32 divisors (see below), whose sum is σ = 91238400. Its totient is φ = 49196160.

The previous prime is 68521309. The next prime is 68521331. The reversal of 68521315 is 51312586.

It is not a de Polignac number, because 68521315 - 2³ = 68521307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155866 + ... + 156304.

It is an arithmetic number, because the mean of its divisors is an integer number (2851200).

Almost surely, 2^68521315 is an apocalyptic number.

68521315 is a deficient number, since it is larger than the sum of its proper divisors (22717085).

68521315 is a wasteful number, since it uses less digits than its factorization.

68521315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547.

The product of its digits is 7200, while the sum is 31.

The square root of 68521315 is about 8277.7602647093. The cubic root of 68521315 is about 409.2059089562.

The spelling of 68521315 in words is "sixty-eight million, five hundred twenty-one thousand, three hundred fifteen".