67628879 has 4 divisors (see below), whose sum is σ = 68555376. Its totient is φ = 66702384.

The previous prime is 67628851. The next prime is 67628959. The reversal of 67628879 is 97882676.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67628879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67628879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67628179) 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, 463139 + ... + 463284.

It is an arithmetic number, because the mean of its divisors is an integer number (17138844).

Almost surely, 2^67628879 is an apocalyptic number.

67628879 is a deficient number, since it is larger than the sum of its proper divisors (926497).

67628879 is an equidigital number, since it uses as much as digits as its factorization.

67628879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926496.

The product of its digits is 2032128, while the sum is 53.

The square root of 67628879 is about 8223.6779484608. The cubic root of 67628879 is about 407.4216121317.

The spelling of 67628879 in words is "sixty-seven million, six hundred twenty-eight thousand, eight hundred seventy-nine".