66739320 has 96 divisors (see below), whose sum is σ = 219445200. Its totient is φ = 17588736.

The previous prime is 66739319. The next prime is 66739339. The reversal of 66739320 is 2393766.

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 23 ways as a sum of consecutive naturals, for example, 30999 + ... + 33081.

Almost surely, 2^66739320 is an apocalyptic number.

66739320 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 66739320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109722600).

66739320 is an abundant number, since it is smaller than the sum of its proper divisors (152705880).

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

66739320 is a wasteful number, since it uses less digits than its factorization.

66739320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189 (or 2182 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 66739320 is about 8169.4136876523. The cubic root of 66739320 is about 405.6273769787.

The spelling of 66739320 in words is "sixty-six million, seven hundred thirty-nine thousand, three hundred twenty".