66372240 has 160 divisors (see below), whose sum is σ = 231985152. Its totient is φ = 15552000.

The previous prime is 66372239. The next prime is 66372259. The reversal of 66372240 is 4227366.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66372198 and 66372207.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81435 + ... + 82245.

Almost surely, 2^66372240 is an apocalyptic number.

66372240 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 66372240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115992576).

66372240 is an abundant number, since it is smaller than the sum of its proper divisors (165612912).

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

66372240 is a wasteful number, since it uses less digits than its factorization.

66372240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 66372240 is about 8146.9159809096. The cubic root of 66372240 is about 404.8823313089.

The spelling of 66372240 in words is "sixty-six million, three hundred seventy-two thousand, two hundred forty".