66715344 has 60 divisors (see below), whose sum is σ = 197700516. Its totient is φ = 20929536.

The previous prime is 66715343. The next prime is 66715349. The reversal of 66715344 is 44351766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43560000 + 23155344 = 6600^2 + 4812^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 66715299 and 66715308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66715343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11179 + ... + 16074.

Almost surely, 2^66715344 is an apocalyptic number.

It is an amenable number.

66715344 is an abundant number, since it is smaller than the sum of its proper divisors (130985172).

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

66715344 is a wasteful number, since it uses less digits than its factorization.

66715344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27284 (or 27275 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66715344 is about 8167.9461310662. The cubic root of 66715344 is about 405.5787974865.

The spelling of 66715344 in words is "sixty-six million, seven hundred fifteen thousand, three hundred forty-four".