80747280 has 200 divisors, whose sum is σ = 297349272. Its totient is φ = 20238336.

The previous prime is 80747239. The next prime is 80747287. The reversal of 80747280 is 8274708.

It can be written as a sum of positive squares in 4 ways, for example, as 40602384 + 40144896 = 6372^2 + 6336^2 .

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

It is not an unprimeable number, because it can be changed into a prime (80747287) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 109794 + ... + 110526.

Almost surely, 2^80747280 is an apocalyptic number.

80747280 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 80747280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148674636).

80747280 is an abundant number, since it is smaller than the sum of its proper divisors (216601992).

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

80747280 is a wasteful number, since it uses less digits than its factorization.

80747280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 760 counting only the distinct ones).

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

The square root of 80747280 is about 8985.9490316827. The cubic root of 80747280 is about 432.2244204323.

The spelling of 80747280 in words is "eighty million, seven hundred forty-seven thousand, two hundred eighty".