66793128 has 16 divisors (see below), whose sum is σ = 166982880. Its totient is φ = 22264368.

The previous prime is 66793123. The next prime is 66793169. The reversal of 66793128 is 82139766.

It is a happy number.

It is a super-2 number, since 2×66793128² = 8922643896048768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66793128.

It is not an unprimeable number, because it can be changed into a prime (66793123) 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, 1391500 + ... + 1391547.

It is an arithmetic number, because the mean of its divisors is an integer number (10436430).

Almost surely, 2^66793128 is an apocalyptic number.

It is an amenable number.

66793128 is an abundant number, since it is smaller than the sum of its proper divisors (100189752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66793128 is a wasteful number, since it uses less digits than its factorization.

66793128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783056 (or 2783052 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 66793128 is about 8172.7062837227. The cubic root of 66793128 is about 405.7363588845.

The spelling of 66793128 in words is "sixty-six million, seven hundred ninety-three thousand, one hundred twenty-eight".