66263728 has 10 divisors (see below), whose sum is σ = 128386004. Its totient is φ = 33131856.

The previous prime is 66263723. The next prime is 66263767. The reversal of 66263728 is 82736266.

It is not an unprimeable number, because it can be changed into a prime (66263723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2070726 + ... + 2070757.

Almost surely, 2^66263728 is an apocalyptic number.

It is an amenable number.

66263728 is a deficient number, since it is larger than the sum of its proper divisors (62122276).

66263728 is a wasteful number, since it uses less digits than its factorization.

66263728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141491 (or 4141485 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 66263728 is about 8140.2535587044. The cubic root of 66263728 is about 404.6615635291.

The spelling of 66263728 in words is "sixty-six million, two hundred sixty-three thousand, seven hundred twenty-eight".