66562620 has 48 divisors (see below), whose sum is σ = 189544320. Its totient is φ = 17448256.

The previous prime is 66562619. The next prime is 66562631. The reversal of 66562620 is 2626566.

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 15 ways as a sum of consecutive naturals, for example, 5862 + ... + 12941.

It is an arithmetic number, because the mean of its divisors is an integer number (3948840).

Almost surely, 2^66562620 is an apocalyptic number.

66562620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66562620 is an abundant number, since it is smaller than the sum of its proper divisors (122981700).

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

66562620 is a wasteful number, since it uses less digits than its factorization.

66562620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18874 (or 18872 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 66562620 is about 8158.5917902540. The cubic root of 66562620 is about 405.2690789215.

The spelling of 66562620 in words is "sixty-six million, five hundred sixty-two thousand, six hundred twenty".