66870272 has 88 divisors (see below), whose sum is σ = 161139840. Its totient is φ = 27095040.

The previous prime is 66870247. The next prime is 66870277. The reversal of 66870272 is 27207866.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66870277) 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, 135947 + ... + 136437.

Almost surely, 2^66870272 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 66870272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80569920).

66870272 is an abundant number, since it is smaller than the sum of its proper divisors (94269568).

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

66870272 is a wasteful number, since it uses less digits than its factorization.

66870272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 66870272 is about 8177.4245334335. The cubic root of 66870272 is about 405.8925031072.

The spelling of 66870272 in words is "sixty-six million, eight hundred seventy thousand, two hundred seventy-two".