280020897 has 24 divisors (see below), whose sum is σ = 450613800. Its totient is φ = 166376448.

The previous prime is 280020887. The next prime is 280020899. The reversal of 280020897 is 798020082.

It can be written as a sum of positive squares in 4 ways, for example, as 1498176 + 278522721 = 1224^2 + 16689^2 .

It is not a de Polignac number, because 280020897 - 2¹⁵ = 279988129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280020899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37872 + ... + 44657.

It is an arithmetic number, because the mean of its divisors is an integer number (18775575).

Almost surely, 2^280020897 is an apocalyptic number.

It is an amenable number.

280020897 is a deficient number, since it is larger than the sum of its proper divisors (170592903).

280020897 is a wasteful number, since it uses less digits than its factorization.

280020897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82577 (or 82574 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 280020897 is about 16733.8249363378. The cubic root of 280020897 is about 654.2295367454.

The spelling of 280020897 in words is "two hundred eighty million, twenty thousand, eight hundred ninety-seven".