66425724 has 24 divisors (see below), whose sum is σ = 172215120. Its totient is φ = 22141872.

The previous prime is 66425719. The next prime is 66425731. The reversal of 66425724 is 42752466.

66425724 is a `hidden beast` number, since 6 + 642 + 5 + 7 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307419 + ... + 307634.

It is an arithmetic number, because the mean of its divisors is an integer number (7175630).

Almost surely, 2^66425724 is an apocalyptic number.

It is an amenable number.

66425724 is an abundant number, since it is smaller than the sum of its proper divisors (105789396).

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

66425724 is a wasteful number, since it uses less digits than its factorization.

66425724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615066 (or 615058 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 66425724 is about 8150.1977890110. The cubic root of 66425724 is about 404.9910560439.

The spelling of 66425724 in words is "sixty-six million, four hundred twenty-five thousand, seven hundred twenty-four".