80740820 has 72 divisors (see below), whose sum is σ = 183868440. Its totient is φ = 29767680.

The previous prime is 80740817. The next prime is 80740831. The reversal of 80740820 is 2804708.

It can be written as a sum of positive squares in 12 ways, for example, as 3511876 + 77228944 = 1874^2 + 8788^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 352466 + ... + 352694.

Almost surely, 2^80740820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80740820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91934220).

80740820 is an abundant number, since it is smaller than the sum of its proper divisors (103127620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80740820 is a wasteful number, since it uses less digits than its factorization.

80740820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 80740820 is about 8985.5895744242. The cubic root of 80740820 is about 432.2128937521.

The spelling of 80740820 in words is "eighty million, seven hundred forty thousand, eight hundred twenty".