280430832 has 80 divisors (see below), whose sum is σ = 796199040. Its totient is φ = 84345600.

The previous prime is 280430831. The next prime is 280430833. The reversal of 280430832 is 238034082.

It is an interprime number because it is at equal distance from previous prime (280430831) and next prime (280430833).

It is a self number, because there is not a number n which added to its sum of digits gives 280430832.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280430831) 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, 71482 + ... + 75302.

It is an arithmetic number, because the mean of its divisors is an integer number (9952488).

Almost surely, 2^280430832 is an apocalyptic number.

280430832 is a gapful number since it is divisible by the number (22) 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 280430832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398099520).

280430832 is an abundant number, since it is smaller than the sum of its proper divisors (515768208).

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

280430832 is a wasteful number, since it uses less digits than its factorization.

280430832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982 (or 3976 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 280430832 is about 16746.0691506992. The cubic root of 280430832 is about 654.5486329531.

The spelling of 280430832 in words is "two hundred eighty million, four hundred thirty thousand, eight hundred thirty-two".