66938192 has 20 divisors (see below), whose sum is σ = 129837300. Its totient is φ = 33431808.

The previous prime is 66938191. The next prime is 66938213. The reversal of 66938192 is 29183966.

It can be written as a sum of positive squares in 2 ways, for example, as 1263376 + 65674816 = 1124^2 + 8104^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66938191) 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, 17684 + ... + 21132.

It is an arithmetic number, because the mean of its divisors is an integer number (6491865).

Almost surely, 2^66938192 is an apocalyptic number.

It is an amenable number.

66938192 is a deficient number, since it is larger than the sum of its proper divisors (62899108).

66938192 is a wasteful number, since it uses less digits than its factorization.

66938192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670 (or 4664 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 66938192 is about 8181.5763762248. The cubic root of 66938192 is about 406.0298780054.

The spelling of 66938192 in words is "sixty-six million, nine hundred thirty-eight thousand, one hundred ninety-two".