66372740 has 48 divisors (see below), whose sum is σ = 160591872. Its totient is φ = 22571136.

The previous prime is 66372731. The next prime is 66372749. The reversal of 66372740 is 4727366.

It is an interprime number because it is at equal distance from previous prime (66372731) and next prime (66372749).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 66372740.

It is not an unprimeable number, because it can be changed into a prime (66372749) 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, 15914 + ... + 19646.

It is an arithmetic number, because the mean of its divisors is an integer number (3345664).

Almost surely, 2^66372740 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 66372740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80295936).

66372740 is an abundant number, since it is smaller than the sum of its proper divisors (94219132).

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

66372740 is a wasteful number, since it uses less digits than its factorization.

66372740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876 (or 3874 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 66372740 is about 8146.9466673104. The cubic root of 66372740 is about 404.8833480023.

The spelling of 66372740 in words is "sixty-six million, three hundred seventy-two thousand, seven hundred forty".