280113444 has 144 divisors (see below), whose sum is σ = 799344000. Its totient is φ = 84779136.

The previous prime is 280113443. The next prime is 280113451. The reversal of 280113444 is 444311082.

It is a super-2 number, since 2×280113444² = 156927083019082272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (280113443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1879882 + ... + 1880030.

It is an arithmetic number, because the mean of its divisors is an integer number (5551000).

Almost surely, 2^280113444 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 280113444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399672000).

280113444 is an abundant number, since it is smaller than the sum of its proper divisors (519230556).

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

280113444 is a wasteful number, since it uses less digits than its factorization.

280113444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 280113444 is about 16736.5899752608. The cubic root of 280113444 is about 654.3016031668.

The spelling of 280113444 in words is "two hundred eighty million, one hundred thirteen thousand, four hundred forty-four".