66933780 has 48 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 17726848.

The previous prime is 66933761. The next prime is 66933787. The reversal of 66933780 is 8733966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66933787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5197 + ... + 12683.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^66933780 is an apocalyptic number.

66933780 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 66933780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

66933780 is an abundant number, since it is smaller than the sum of its proper divisors (121763820).

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

66933780 is a wasteful number, since it uses less digits than its factorization.

66933780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7648 (or 7646 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 66933780 is about 8181.3067415909. The cubic root of 66933780 is about 406.0209571231.

The spelling of 66933780 in words is "sixty-six million, nine hundred thirty-three thousand, seven hundred eighty".