66326620 has 24 divisors (see below), whose sum is σ = 141649200. Its totient is φ = 26080512.

The previous prime is 66326591. The next prime is 66326647. The reversal of 66326620 is 2662366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26925 + ... + 29284.

It is an arithmetic number, because the mean of its divisors is an integer number (5902050).

Almost surely, 2^66326620 is an apocalyptic number.

It is an amenable number.

66326620 is an abundant number, since it is smaller than the sum of its proper divisors (75322580).

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

66326620 is a wasteful number, since it uses less digits than its factorization.

66326620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56277 (or 56275 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 66326620 is about 8144.1156671550. The cubic root of 66326620 is about 404.7895467078.

Adding to 66326620 its reverse (2662366), we get a palindrome (68988986).

The spelling of 66326620 in words is "sixty-six million, three hundred twenty-six thousand, six hundred twenty".