66191232 has 32 divisors (see below), whose sum is σ = 175821480. Its totient is φ = 22063616.

The previous prime is 66191197. The next prime is 66191239. The reversal of 66191232 is 23219166.

It is a tau number, because it is divible by the number of its divisors (32).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66191232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66191239) 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, 85803 + ... + 86570.

Almost surely, 2^66191232 is an apocalyptic number.

It is an amenable number.

66191232 is an abundant number, since it is smaller than the sum of its proper divisors (109630248).

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

66191232 is a wasteful number, since it uses less digits than its factorization.

66191232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172390 (or 172378 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 66191232 is about 8135.7994075567. The cubic root of 66191232 is about 404.5139360080.

The spelling of 66191232 in words is "sixty-six million, one hundred ninety-one thousand, two hundred thirty-two".