280390896 has 90 divisors (see below), whose sum is σ = 815149712. Its totient is φ = 93428640.

The previous prime is 280390889. The next prime is 280390897. The reversal of 280390896 is 698093082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280390897) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103641 + ... + 106311.

Almost surely, 2^280390896 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 280390896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407574856).

280390896 is an abundant number, since it is smaller than the sum of its proper divisors (534758816).

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

280390896 is an frugal number, since it uses more digits than its factorization.

280390896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703 (or 2676 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 280390896 is about 16744.8767090116. The cubic root of 280390896 is about 654.5175601749.

The spelling of 280390896 in words is "two hundred eighty million, three hundred ninety thousand, eight hundred ninety-six".