66715460 has 72 divisors (see below), whose sum is σ = 171601920. Its totient is φ = 21663936.

The previous prime is 66715447. The next prime is 66715471. The reversal of 66715460 is 6451766.

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 66715460.

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, 16829 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (2383360).

Almost surely, 2^66715460 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 66715460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85800960).

66715460 is an abundant number, since it is smaller than the sum of its proper divisors (104886460).

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

66715460 is a wasteful number, since it uses less digits than its factorization.

66715460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625 (or 3616 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66715460 is about 8167.9532319915. The cubic root of 66715460 is about 405.5790325504.

The spelling of 66715460 in words is "sixty-six million, seven hundred fifteen thousand, four hundred sixty".