66247236 has 72 divisors (see below), whose sum is σ = 183927744. Its totient is φ = 19938240.

The previous prime is 66247211. The next prime is 66247253. The reversal of 66247236 is 63274266.

It is a happy number.

66247236 is a `hidden beast` number, since 6 + 624 + 7 + 23 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66247236.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68025 + ... + 68991.

It is an arithmetic number, because the mean of its divisors is an integer number (2554552).

Almost surely, 2^66247236 is an apocalyptic number.

66247236 is a gapful number since it is divisible by the number (66) 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 66247236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91963872).

66247236 is an abundant number, since it is smaller than the sum of its proper divisors (117680508).

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

66247236 is a wasteful number, since it uses less digits than its factorization.

66247236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1156 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 66247236 is about 8139.2405051086. The cubic root of 66247236 is about 404.6279894434.

The spelling of 66247236 in words is "sixty-six million, two hundred forty-seven thousand, two hundred thirty-six".