68015399 has 4 divisors (see below), whose sum is σ = 68117136. Its totient is φ = 67913664.

The previous prime is 68015369. The next prime is 68015401. The reversal of 68015399 is 99351086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68015399 - 2¹⁶ = 67949863 is a prime.

It is a super-2 number, since 2×68015399² = 9252189002258402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68015359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49859 + ... + 51204.

It is an arithmetic number, because the mean of its divisors is an integer number (17029284).

Almost surely, 2^68015399 is an apocalyptic number.

68015399 is a deficient number, since it is larger than the sum of its proper divisors (101737).

68015399 is a wasteful number, since it uses less digits than its factorization.

68015399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101736.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 68015399 is about 8247.1448999032. The cubic root of 68015399 is about 408.1963183599.

The spelling of 68015399 in words is "sixty-eight million, fifteen thousand, three hundred ninety-nine".