83728079 has 4 divisors (see below), whose sum is σ = 88134840. Its totient is φ = 79321320.

The previous prime is 83728049. The next prime is 83728081. The reversal of 83728079 is 97082738.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83728079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83728049) 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, 2203352 + ... + 2203389.

It is an arithmetic number, because the mean of its divisors is an integer number (22033710).

Almost surely, 2^83728079 is an apocalyptic number.

83728079 is a deficient number, since it is larger than the sum of its proper divisors (4406761).

83728079 is a wasteful number, since it uses less digits than its factorization.

83728079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406760.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 83728079 is about 9150.3048583094. The cubic root of 83728079 is about 437.4788304315.

The spelling of 83728079 in words is "eighty-three million, seven hundred twenty-eight thousand, seventy-nine".