66971748 has 12 divisors (see below), whose sum is σ = 156267440. Its totient is φ = 22323912.

The previous prime is 66971741. The next prime is 66971761. The reversal of 66971748 is 84717966.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66971697 and 66971706.

It is not an unprimeable number, because it can be changed into a prime (66971741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2790478 + ... + 2790501.

Almost surely, 2^66971748 is an apocalyptic number.

It is an amenable number.

66971748 is an abundant number, since it is smaller than the sum of its proper divisors (89295692).

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

66971748 is a wasteful number, since it uses less digits than its factorization.

66971748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580986 (or 5580984 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 66971748 is about 8183.6268243365. The cubic root of 66971748 is about 406.0977140300.

The spelling of 66971748 in words is "sixty-six million, nine hundred seventy-one thousand, seven hundred forty-eight".