66928379 has 4 divisors (see below), whose sum is σ = 76489584. Its totient is φ = 57367176.

The previous prime is 66928333. The next prime is 66928387. The reversal of 66928379 is 97382966.

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

It is a cyclic number.

It is not a de Polignac number, because 66928379 - 2⁸ = 66928123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66928579) 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, 4780592 + ... + 4780605.

It is an arithmetic number, because the mean of its divisors is an integer number (19122396).

Almost surely, 2^66928379 is an apocalyptic number.

66928379 is a deficient number, since it is larger than the sum of its proper divisors (9561205).

66928379 is an equidigital number, since it uses as much as digits as its factorization.

66928379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9561204.

The product of its digits is 979776, while the sum is 50.

The square root of 66928379 is about 8180.9766531876. The cubic root of 66928379 is about 406.0100359900.

The spelling of 66928379 in words is "sixty-six million, nine hundred twenty-eight thousand, three hundred seventy-nine".