66187472 has 20 divisors (see below), whose sum is σ = 138103140. Its totient is φ = 30547968.

The previous prime is 66187463. The next prime is 66187519. The reversal of 66187472 is 27478166.

It can be written as a sum of positive squares in 2 ways, for example, as 6031936 + 60155536 = 2456^2 + 7756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158897 + ... + 159312.

It is an arithmetic number, because the mean of its divisors is an integer number (6905157).

Almost surely, 2^66187472 is an apocalyptic number.

It is an amenable number.

66187472 is an abundant number, since it is smaller than the sum of its proper divisors (71915668).

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

66187472 is a wasteful number, since it uses less digits than its factorization.

66187472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318230 (or 318224 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 66187472 is about 8135.5683267981. The cubic root of 66187472 is about 404.5062763772.

The spelling of 66187472 in words is "sixty-six million, one hundred eighty-seven thousand, four hundred seventy-two".