66724879 has 8 divisors (see below), whose sum is σ = 72530640. Its totient is φ = 61015296.

The previous prime is 66724873. The next prime is 66724883. The reversal of 66724879 is 97842766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66724879 - 2⁹ = 66724367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22594 + ... + 25375.

It is an arithmetic number, because the mean of its divisors is an integer number (9066330).

Almost surely, 2^66724879 is an apocalyptic number.

66724879 is a deficient number, since it is larger than the sum of its proper divisors (5805761).

66724879 is a wasteful number, since it uses less digits than its factorization.

66724879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48089.

The product of its digits is 1016064, while the sum is 49.

The square root of 66724879 is about 8168.5297942775. The cubic root of 66724879 is about 405.5981184272.

The spelling of 66724879 in words is "sixty-six million, seven hundred twenty-four thousand, eight hundred seventy-nine".