68128413 has 4 divisors (see below), whose sum is σ = 90837888. Its totient is φ = 45418940.

The previous prime is 68128409. The next prime is 68128441. The reversal of 68128413 is 31482186.

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 68128413 - 2² = 68128409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68128513) 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, 11354733 + ... + 11354738.

It is an arithmetic number, because the mean of its divisors is an integer number (22709472).

Almost surely, 2^68128413 is an apocalyptic number.

It is an amenable number.

68128413 is a deficient number, since it is larger than the sum of its proper divisors (22709475).

68128413 is a wasteful number, since it uses less digits than its factorization.

68128413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22709474.

The product of its digits is 9216, while the sum is 33.

The square root of 68128413 is about 8253.9937605986. The cubic root of 68128413 is about 408.4222788146.

It can be divided in two parts, 6812 and 8413, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 68128413 in words is "sixty-eight million, one hundred twenty-eight thousand, four hundred thirteen".