67991413 has 4 divisors (see below), whose sum is σ = 77704480. Its totient is φ = 58278348.

The previous prime is 67991389. The next prime is 67991419. The reversal of 67991413 is 31419976.

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 a de Polignac number, because none of the positive numbers 2^k-67991413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67991419) 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, 4856523 + ... + 4856536.

It is an arithmetic number, because the mean of its divisors is an integer number (19426120).

Almost surely, 2^67991413 is an apocalyptic number.

It is an amenable number.

67991413 is a deficient number, since it is larger than the sum of its proper divisors (9713067).

67991413 is an equidigital number, since it uses as much as digits as its factorization.

67991413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713066.

The product of its digits is 40824, while the sum is 40.

The square root of 67991413 is about 8245.6905714440. The cubic root of 67991413 is about 408.1483285016.

The spelling of 67991413 in words is "sixty-seven million, nine hundred ninety-one thousand, four hundred thirteen".