83446721 has 4 divisors (see below), whose sum is σ = 83539632. Its totient is φ = 83353812.

The previous prime is 83446711. The next prime is 83446733. The reversal of 83446721 is 12764438.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83446721 - 2¹⁴ = 83430337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83446711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45095 + ... + 46908.

It is an arithmetic number, because the mean of its divisors is an integer number (20884908).

Almost surely, 2^83446721 is an apocalyptic number.

It is an amenable number.

83446721 is a deficient number, since it is larger than the sum of its proper divisors (92911).

83446721 is an equidigital number, since it uses as much as digits as its factorization.

83446721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92910.

The product of its digits is 32256, while the sum is 35.

The square root of 83446721 is about 9134.9176788847. The cubic root of 83446721 is about 436.9882490858.

The spelling of 83446721 in words is "eighty-three million, four hundred forty-six thousand, seven hundred twenty-one".