66969620 has 12 divisors (see below), whose sum is σ = 140636244. Its totient is φ = 26787840.

The previous prime is 66969611. The next prime is 66969653. The reversal of 66969620 is 2696966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46430596 + 20539024 = 6814^2 + 4532^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1674221 + ... + 1674260.

It is an arithmetic number, because the mean of its divisors is an integer number (11719687).

Almost surely, 2^66969620 is an apocalyptic number.

It is an amenable number.

66969620 is an abundant number, since it is smaller than the sum of its proper divisors (73666624).

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

66969620 is a wasteful number, since it uses less digits than its factorization.

66969620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348490 (or 3348488 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 66969620 is about 8183.4968076000. The cubic root of 66969620 is about 406.0934127880.

The spelling of 66969620 in words is "sixty-six million, nine hundred sixty-nine thousand, six hundred twenty".