68398913 has 4 divisors (see below), whose sum is σ = 74617008. Its totient is φ = 62180820.

The previous prime is 68398909. The next prime is 68398919. The reversal of 68398913 is 31989386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68398913 - 2² = 68398909 is a prime.

It is a super-2 number, since 2×68398913² = 9356822599163138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68398919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3109031 + ... + 3109052.

It is an arithmetic number, because the mean of its divisors is an integer number (18654252).

Almost surely, 2^68398913 is an apocalyptic number.

It is an amenable number.

68398913 is a deficient number, since it is larger than the sum of its proper divisors (6218095).

68398913 is a wasteful number, since it uses less digits than its factorization.

68398913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6218094.

The product of its digits is 279936, while the sum is 47.

The square root of 68398913 is about 8270.3635349361. The cubic root of 68398913 is about 408.9621041600.

The spelling of 68398913 in words is "sixty-eight million, three hundred ninety-eight thousand, nine hundred thirteen".