66862620 has 72 divisors (see below), whose sum is σ = 221261040. Its totient is φ = 16208640.

The previous prime is 66862619. The next prime is 66862637. The reversal of 66862620 is 2626866.

66862620 is a `hidden beast` number, since 6 + 6 + 8 + 626 + 20 = 666.

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

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14905 + ... + 18864.

It is an arithmetic number, because the mean of its divisors is an integer number (3073070).

Almost surely, 2^66862620 is an apocalyptic number.

66862620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66862620 is an abundant number, since it is smaller than the sum of its proper divisors (154398420).

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

66862620 is a wasteful number, since it uses less digits than its factorization.

66862620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33795 (or 33790 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 66862620 is about 8176.9566465770. The cubic root of 66862620 is about 405.8770203532.

The spelling of 66862620 in words is "sixty-six million, eight hundred sixty-two thousand, six hundred twenty".