280661248 has 36 divisors (see below), whose sum is σ = 640262560. Its totient is φ = 120282624.

The previous prime is 280661221. The next prime is 280661257. The reversal of 280661248 is 842166082.

It is a super-2 number, since 2×280661248² = 157541472257835008, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76518 + ... + 80101.

Almost surely, 2^280661248 is an apocalyptic number.

280661248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

280661248 is an abundant number, since it is smaller than the sum of its proper divisors (359601312).

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

280661248 is an equidigital number, since it uses as much as digits as its factorization.

280661248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156642 (or 156628 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 280661248 is about 16752.9474421667. The cubic root of 280661248 is about 654.7278538433.

The spelling of 280661248 in words is "two hundred eighty million, six hundred sixty-one thousand, two hundred forty-eight".