66072840 has 32 divisors (see below), whose sum is σ = 198218880. Its totient is φ = 17619392.

The previous prime is 66072833. The next prime is 66072841. The reversal of 66072840 is 4827066.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66072841) 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, 275184 + ... + 275423.

It is an arithmetic number, because the mean of its divisors is an integer number (6194340).

Almost surely, 2^66072840 is an apocalyptic number.

66072840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66072840 is an abundant number, since it is smaller than the sum of its proper divisors (132146040).

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

66072840 is a wasteful number, since it uses less digits than its factorization.

66072840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550621 (or 550617 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66072840 is about 8128.5201605212. The cubic root of 66072840 is about 404.2726160517.

The spelling of 66072840 in words is "sixty-six million, seventy-two thousand, eight hundred forty".