66471760 has 40 divisors (see below), whose sum is σ = 157177440. Its totient is φ = 26136192.

The previous prime is 66471737. The next prime is 66471763. The reversal of 66471760 is 6717466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66471763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2322 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (3929436).

Almost surely, 2^66471760 is an apocalyptic number.

It is an amenable number.

66471760 is an abundant number, since it is smaller than the sum of its proper divisors (90705680).

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

66471760 is a wasteful number, since it uses less digits than its factorization.

66471760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14155 (or 14149 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66471760 is about 8153.0215257903. The cubic root of 66471760 is about 405.0845934152.

The spelling of 66471760 in words is "sixty-six million, four hundred seventy-one thousand, seven hundred sixty".