66928763 has 8 divisors (see below), whose sum is σ = 73254720. Its totient is φ = 60643080.

The previous prime is 66928759. The next prime is 66928831. The reversal of 66928763 is 36782966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66928763 - 2² = 66928759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66928753) 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, 6533 + ... + 13286.

It is an arithmetic number, because the mean of its divisors is an integer number (9156840).

Almost surely, 2^66928763 is an apocalyptic number.

66928763 is a deficient number, since it is larger than the sum of its proper divisors (6325957).

66928763 is a wasteful number, since it uses less digits than its factorization.

66928763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20137.

The product of its digits is 653184, while the sum is 47.

The square root of 66928763 is about 8181.0001222344. Note that the first 3 decimals coincide. The cubic root of 66928763 is about 406.0108124795.

It can be divided in two parts, 66 and 928763, that added together give a palindrome (928829).

The spelling of 66928763 in words is "sixty-six million, nine hundred twenty-eight thousand, seven hundred sixty-three".