66240406 has 16 divisors (see below), whose sum is σ = 100638720. Its totient is φ = 32697000.

The previous prime is 66240401. The next prime is 66240439. The reversal of 66240406 is 60404266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66240401) 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, 63235 + ... + 64273.

It is an arithmetic number, because the mean of its divisors is an integer number (6289920).

Almost surely, 2^66240406 is an apocalyptic number.

66240406 is a deficient number, since it is larger than the sum of its proper divisors (34398314).

66240406 is a wasteful number, since it uses less digits than its factorization.

66240406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66240406 is about 8138.8209219764. The cubic root of 66240406 is about 404.6140834336.

The spelling of 66240406 in words is "sixty-six million, two hundred forty thousand, four hundred six".