66079820 has 24 divisors (see below), whose sum is σ = 141996624. Its totient is φ = 25816896.

The previous prime is 66079813. The next prime is 66079829. The reversal of 66079820 is 2897066.

It is a super-2 number, since 2×66079820² = 8733085222464800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66079829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37559 + ... + 39278.

It is an arithmetic number, because the mean of its divisors is an integer number (5916526).

Almost surely, 2^66079820 is an apocalyptic number.

It is an amenable number.

66079820 is an abundant number, since it is smaller than the sum of its proper divisors (75916804).

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

66079820 is a wasteful number, since it uses less digits than its factorization.

66079820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76889 (or 76887 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 66079820 is about 8128.9495016269. The cubic root of 66079820 is about 404.2868514698.

The spelling of 66079820 in words is "sixty-six million, seventy-nine thousand, eight hundred twenty".