83327721 has 16 divisors (see below), whose sum is σ = 115814400. Its totient is φ = 53231760.

The previous prime is 83327707. The next prime is 83327729. The reversal of 83327721 is 12772338.

It is not a de Polignac number, because 83327721 - 2¹⁰ = 83326697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83327729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5230 + ... + 13928.

It is an arithmetic number, because the mean of its divisors is an integer number (7238400).

Almost surely, 2^83327721 is an apocalyptic number.

It is an amenable number.

83327721 is a deficient number, since it is larger than the sum of its proper divisors (32486679).

83327721 is a wasteful number, since it uses less digits than its factorization.

83327721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8836.

The product of its digits is 14112, while the sum is 33.

The square root of 83327721 is about 9128.4018864202. The cubic root of 83327721 is about 436.7804264985.

It can be divided in two parts, 83327 and 721, that added together give a palindrome (84048).

The spelling of 83327721 in words is "eighty-three million, three hundred twenty-seven thousand, seven hundred twenty-one".