66979384 has 8 divisors (see below), whose sum is σ = 125586360. Its totient is φ = 33489688.

The previous prime is 66979349. The next prime is 66979387. The reversal of 66979384 is 48397966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66979387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4186204 + ... + 4186219.

It is an arithmetic number, because the mean of its divisors is an integer number (15698295).

Almost surely, 2^66979384 is an apocalyptic number.

It is an amenable number.

66979384 is a deficient number, since it is larger than the sum of its proper divisors (58606976).

66979384 is a wasteful number, since it uses less digits than its factorization.

66979384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8372429 (or 8372425 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 52.

The square root of 66979384 is about 8184.0933523513. The cubic root of 66979384 is about 406.1131476240.

The spelling of 66979384 in words is "sixty-six million, nine hundred seventy-nine thousand, three hundred eighty-four".