66746487 has 32 divisors (see below), whose sum is σ = 97920000. Its totient is φ = 40279680.

The previous prime is 66746473. The next prime is 66746489. The reversal of 66746487 is 78464766.

It is a happy number.

It is not a de Polignac number, because 66746487 - 2⁶ = 66746423 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66746489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246162 + ... + 246432.

It is an arithmetic number, because the mean of its divisors is an integer number (3060000).

Almost surely, 2^66746487 is an apocalyptic number.

66746487 is a deficient number, since it is larger than the sum of its proper divisors (31173513).

66746487 is a wasteful number, since it uses less digits than its factorization.

66746487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 1354752, while the sum is 48.

The square root of 66746487 is about 8169.8523242467. The cubic root of 66746487 is about 405.6418962923.

The spelling of 66746487 in words is "sixty-six million, seven hundred forty-six thousand, four hundred eighty-seven".