280748940 has 48 divisors (see below), whose sum is σ = 827473920. Its totient is φ = 70925760.

The previous prime is 280748939. The next prime is 280748957. The reversal of 280748940 is 49847082.

280748940 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×280748940² = 157639934622247200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 280748892 and 280748901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121996 + ... + 124275.

It is an arithmetic number, because the mean of its divisors is an integer number (17239040).

Almost surely, 2^280748940 is an apocalyptic number.

280748940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280748940 is an abundant number, since it is smaller than the sum of its proper divisors (546724980).

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

280748940 is a wasteful number, since it uses less digits than its factorization.

280748940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246302 (or 246300 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 280748940 is about 16755.5644488630. The cubic root of 280748940 is about 654.7960361766.

The spelling of 280748940 in words is "two hundred eighty million, seven hundred forty-eight thousand, nine hundred forty".