280000025 has 6 divisors (see below), whose sum is σ = 347200062. Its totient is φ = 224000000.

The previous prime is 279999991. The next prime is 280000027. The reversal of 280000025 is 520000082.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 28174864 + 251825161 = 5308^2 + 15869^2 .

It is not a de Polignac number, because 280000025 - 2¹⁰ = 279999001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 279999958 and 280000012.

It is not an unprimeable number, because it can be changed into a prime (280000027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5599976 + ... + 5600025.

It is an arithmetic number, because the mean of its divisors is an integer number (57866677).

Almost surely, 2^280000025 is an apocalyptic number.

280000025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280000025 is a deficient number, since it is larger than the sum of its proper divisors (67200037).

280000025 is a wasteful number, since it uses less digits than its factorization.

280000025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11200011 (or 11200006 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 280000025 is about 16733.2012776994. The cubic root of 280000025 is about 654.2132815084.

The spelling of 280000025 in words is "two hundred eighty million, twenty-five", and thus it is an aban number.