80720000 has 80 divisors (see below), whose sum is σ = 201146550. Its totient is φ = 32256000.

The previous prime is 80719997. The next prime is 80720011. The reversal of 80720000 is 2708.

It can be written as a sum of positive squares in 5 ways, for example, as 7744 + 80712256 = 88^2 + 8984^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (17) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79496 + ... + 80504.

Almost surely, 2^80720000 is an apocalyptic number.

80720000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100573275).

80720000 is an abundant number, since it is smaller than the sum of its proper divisors (120426550).

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

80720000 is an equidigital number, since it uses as much as digits as its factorization.

80720000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 80720000 is about 8984.4309780865. The cubic root of 80720000 is about 432.1757401123.

Adding to 80720000 its reverse (2708), we get a palindrome (80722708).

The spelling of 80720000 in words is "eighty million, seven hundred twenty thousand".