280988372 has 48 divisors (see below), whose sum is σ = 578188800. Its totient is φ = 116988672.

The previous prime is 280988341. The next prime is 280988377. The reversal of 280988372 is 273889082.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280988377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195368 + ... + 196800.

It is an arithmetic number, because the mean of its divisors is an integer number (12045600).

Almost surely, 2^280988372 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 280988372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289094400).

280988372 is an abundant number, since it is smaller than the sum of its proper divisors (297200428).

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

280988372 is a wasteful number, since it uses less digits than its factorization.

280988372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 280988372 is about 16762.7077764901. The cubic root of 280988372 is about 654.9821272050.

The spelling of 280988372 in words is "two hundred eighty million, nine hundred eighty-eight thousand, three hundred seventy-two".