280220887 has 4 divisors (see below), whose sum is σ = 280261800. Its totient is φ = 280179976.

The previous prime is 280220879. The next prime is 280220893. The reversal of 280220887 is 788022082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280220887 - 2³ = 280220879 is a prime.

It is a super-2 number, since 2×280220887² = 157047491022133538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280220387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7408 + ... + 24805.

It is an arithmetic number, because the mean of its divisors is an integer number (70065450).

Almost surely, 2^280220887 is an apocalyptic number.

280220887 is a deficient number, since it is larger than the sum of its proper divisors (40913).

280220887 is an equidigital number, since it uses as much as digits as its factorization.

280220887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40912.

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 280220887 is about 16739.7994910333. The cubic root of 280220887 is about 654.3852492065.

The spelling of 280220887 in words is "two hundred eighty million, two hundred twenty thousand, eight hundred eighty-seven".