66873280 has 56 divisors (see below), whose sum is σ = 162287712. Its totient is φ = 26237952.

The previous prime is 66873277. The next prime is 66873281. The reversal of 66873280 is 8237866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a zygodrome in base 2 and base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66873281) 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, 14989 + ... + 18931.

Almost surely, 2^66873280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66873280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81143856).

66873280 is an abundant number, since it is smaller than the sum of its proper divisors (95414432).

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

66873280 is a wasteful number, since it uses less digits than its factorization.

66873280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013 (or 4003 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 66873280 is about 8177.6084523533. The cubic root of 66873280 is about 405.8985890520.

The spelling of 66873280 in words is "sixty-six million, eight hundred seventy-three thousand, two hundred eighty".