66140460 has 72 divisors (see below), whose sum is σ = 206069136. Its totient is φ = 17159040.

The previous prime is 66140443. The next prime is 66140461. The reversal of 66140460 is 6404166.

66140460 is a `hidden beast` number, since 6 + 614 + 0 + 46 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (66140461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1695 + ... + 11625.

Almost surely, 2^66140460 is an apocalyptic number.

66140460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66140460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103034568).

66140460 is an abundant number, since it is smaller than the sum of its proper divisors (139928676).

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

66140460 is a wasteful number, since it uses less digits than its factorization.

66140460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9983 (or 9978 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 66140460 is about 8132.6785255536. The cubic root of 66140460 is about 404.4104820489.

The spelling of 66140460 in words is "sixty-six million, one hundred forty thousand, four hundred sixty".