80720280 has 128 divisors (see below), whose sum is σ = 277862400. Its totient is φ = 20822400.

The previous prime is 80720257. The next prime is 80720309. The reversal of 80720280 is 8202708.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32275 + ... + 34685.

It is an arithmetic number, because the mean of its divisors is an integer number (2170800).

Almost surely, 2^80720280 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 80720280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138931200).

80720280 is an abundant number, since it is smaller than the sum of its proper divisors (197142120).

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

80720280 is a wasteful number, since it uses less digits than its factorization.

80720280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 80720280 is about 8984.4465605846. The cubic root of 80720280 is about 432.1762398194.

Adding to 80720280 its reverse (8202708), we get a palindrome (88922988).

The spelling of 80720280 in words is "eighty million, seven hundred twenty thousand, two hundred eighty".