66078572 has 12 divisors (see below), whose sum is σ = 132157200. Its totient is φ = 28319376.

The previous prime is 66078557. The next prime is 66078629. The reversal of 66078572 is 27587066.

It is a happy number.

66078572 is an admirable 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, 1179947 + ... + 1180002.

It is an arithmetic number, because the mean of its divisors is an integer number (11013100).

Almost surely, 2^66078572 is an apocalyptic number.

It is an amenable number.

66078572 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66078572 is a wasteful number, since it uses less digits than its factorization.

66078572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359960 (or 2359958 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 66078572 is about 8128.8727385782. The cubic root of 66078572 is about 404.2843062996.

The spelling of 66078572 in words is "sixty-six million, seventy-eight thousand, five hundred seventy-two".