67979645 has 4 divisors (see below), whose sum is σ = 81575580. Its totient is φ = 54383712.

The previous prime is 67979633. The next prime is 67979647. The reversal of 67979645 is 54697976.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16168441 + 51811204 = 4021^2 + 7198^2 .

It is a cyclic number.

It is not a de Polignac number, because 67979645 - 2⁶ = 67979581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67979647) 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, 6797960 + ... + 6797969.

It is an arithmetic number, because the mean of its divisors is an integer number (20393895).

Almost surely, 2^67979645 is an apocalyptic number.

It is an amenable number.

67979645 is a deficient number, since it is larger than the sum of its proper divisors (13595935).

67979645 is a wasteful number, since it uses less digits than its factorization.

67979645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13595934.

The product of its digits is 2857680, while the sum is 53.

The square root of 67979645 is about 8244.9769556985. The cubic root of 67979645 is about 408.1247796129.

The spelling of 67979645 in words is "sixty-seven million, nine hundred seventy-nine thousand, six hundred forty-five".