66980700 has 108 divisors (see below), whose sum is σ = 221053560. Its totient is φ = 16917120.

The previous prime is 66980657. The next prime is 66980717. The reversal of 66980700 is 708966.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15142 + ... + 19058.

Almost surely, 2^66980700 is an apocalyptic number.

66980700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66980700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110526780).

66980700 is an abundant number, since it is smaller than the sum of its proper divisors (154072860).

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

66980700 is a wasteful number, since it uses less digits than its factorization.

66980700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956 (or 3946 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 66980700 is about 8184.1737518213. The cubic root of 66980700 is about 406.1158073548.

The spelling of 66980700 in words is "sixty-six million, nine hundred eighty thousand, seven hundred".