731280 has 80 divisors (see below), whose sum is σ = 2481984. Its totient is φ = 176640.

The previous prime is 731267. The next prime is 731287. The reversal of 731280 is 82137.

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

It is not an unprimeable number, because it can be changed into a prime (731287) by changing a digit.

731280 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2502 + ... + 2778.

2⁷³¹²⁸⁰ 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 731280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1240992).

731280 is an abundant number, since it is smaller than the sum of its proper divisors (1750704).

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

731280 is a wasteful number, since it uses less digits than its factorization.

731280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 731280 is about 855.1491098048. The cubic root of 731280 is about 90.0937295130.

The spelling of 731280 in words is "seven hundred thirty-one thousand, two hundred eighty".