80862721 has 4 divisors (see below), whose sum is σ = 81663444. Its totient is φ = 80062000.

The previous prime is 80862697. The next prime is 80862731. The reversal of 80862721 is 12726808.

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 76300225 + 4562496 = 8735^2 + 2136^2 .

It is a cyclic number.

It is not a de Polignac number, because 80862721 - 2¹¹ = 80860673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80862731) 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, 400210 + ... + 400411.

It is an arithmetic number, because the mean of its divisors is an integer number (20415861).

Almost surely, 2^80862721 is an apocalyptic number.

It is an amenable number.

80862721 is a deficient number, since it is larger than the sum of its proper divisors (800723).

80862721 is a wasteful number, since it uses less digits than its factorization.

80862721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800722.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 80862721 is about 8992.3701547479. The cubic root of 80862721 is about 432.4303000603.

The spelling of 80862721 in words is "eighty million, eight hundred sixty-two thousand, seven hundred twenty-one".