80700821 has 8 divisors (see below), whose sum is σ = 82357560. Its totient is φ = 79049152.

The previous prime is 80700797. The next prime is 80700857. The reversal of 80700821 is 12800708.

It can be written as a sum of positive squares in 4 ways, for example, as 19704721 + 60996100 = 4439^2 + 7810^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80700821 - 2⁶ = 80700757 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 (80720821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58091 + ... + 59463.

It is an arithmetic number, because the mean of its divisors is an integer number (10294695).

Almost surely, 2^80700821 is an apocalyptic number.

It is an amenable number.

80700821 is a deficient number, since it is larger than the sum of its proper divisors (1656739).

80700821 is a wasteful number, since it uses less digits than its factorization.

80700821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 80700821 is about 8983.3635682855. The cubic root of 80700821 is about 432.1415092109.

The spelling of 80700821 in words is "eighty million, seven hundred thousand, eight hundred twenty-one".