66407740 has 36 divisors (see below), whose sum is σ = 162227016. Its totient is φ = 22768032.

The previous prime is 66407723. The next prime is 66407743. The reversal of 66407740 is 4770466.

It is a junction number, because it is equal to n+sod(n) for n = 66407696 and 66407705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66407743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32902 + ... + 34861.

It is an arithmetic number, because the mean of its divisors is an integer number (4506306).

Almost surely, 2^66407740 is an apocalyptic number.

It is an amenable number.

66407740 is an abundant number, since it is smaller than the sum of its proper divisors (95819276).

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

66407740 is a wasteful number, since it uses less digits than its factorization.

66407740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67786 (or 67777 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66407740 is about 8149.0944282172. The cubic root of 66407740 is about 404.9545038565.

The spelling of 66407740 in words is "sixty-six million, four hundred seven thousand, seven hundred forty".