66417620 has 12 divisors (see below), whose sum is σ = 139477044. Its totient is φ = 26567040.

The previous prime is 66417619. The next prime is 66417649. The reversal of 66417620 is 2671466.

It can be written as a sum of positive squares in 2 ways, for example, as 46185616 + 20232004 = 6796^2 + 4498^2 .

It is a super-2 number, since 2×66417620² = 8822600492928800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 1660421 + ... + 1660460.

It is an arithmetic number, because the mean of its divisors is an integer number (11623087).

Almost surely, 2^66417620 is an apocalyptic number.

It is an amenable number.

66417620 is an abundant number, since it is smaller than the sum of its proper divisors (73059424).

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

66417620 is a wasteful number, since it uses less digits than its factorization.

66417620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320890 (or 3320888 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 66417620 is about 8149.7006079978. The cubic root of 66417620 is about 404.9745856125.

The spelling of 66417620 in words is "sixty-six million, four hundred seventeen thousand, six hundred twenty".