66407782 has 16 divisors (see below), whose sum is σ = 116619552. Its totient is φ = 27766080.

The previous prime is 66407779. The next prime is 66407813. The reversal of 66407782 is 28770466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57273 + ... + 58420.

It is an arithmetic number, because the mean of its divisors is an integer number (7288722).

Almost surely, 2^66407782 is an apocalyptic number.

66407782 is a deficient number, since it is larger than the sum of its proper divisors (50211770).

66407782 is a wasteful number, since it uses less digits than its factorization.

66407782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115743.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 66407782 is about 8149.0970051902. The cubic root of 66407782 is about 404.9545892285.

The spelling of 66407782 in words is "sixty-six million, four hundred seven thousand, seven hundred eighty-two".