80847720 has 80 divisors (see below), whose sum is σ = 271749060. Its totient is φ = 21558528.

The previous prime is 80847709. The next prime is 80847749. The reversal of 80847720 is 2774808.

It can be written as a sum of positive squares in 2 ways, for example, as 80676324 + 171396 = 8982^2 + 414^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9237 + ... + 15716.

Almost surely, 2^80847720 is an apocalyptic number.

It is an amenable number.

80847720 is an abundant number, since it is smaller than the sum of its proper divisors (190901340).

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

80847720 is a wasteful number, since it uses less digits than its factorization.

80847720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24976 (or 24963 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 80847720 is about 8991.5360200580. The cubic root of 80847720 is about 432.4035580791.

The spelling of 80847720 in words is "eighty million, eight hundred forty-seven thousand, seven hundred twenty".