80021365 has 4 divisors (see below), whose sum is σ = 96025644. Its totient is φ = 64017088.

The previous prime is 80021317. The next prime is 80021377. The reversal of 80021365 is 56312008.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26687556 + 53333809 = 5166^2 + 7303^2 .

It is a cyclic number.

It is not a de Polignac number, because 80021365 - 2¹³ = 80013173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8002132 + ... + 8002141.

It is an arithmetic number, because the mean of its divisors is an integer number (24006411).

Almost surely, 2^80021365 is an apocalyptic number.

It is an amenable number.

80021365 is a deficient number, since it is larger than the sum of its proper divisors (16004279).

80021365 is a wasteful number, since it uses less digits than its factorization.

80021365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16004278.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 80021365 is about 8945.4661700774. The cubic root of 80021365 is about 430.9252925065.

The spelling of 80021365 in words is "eighty million, twenty-one thousand, three hundred sixty-five".