280020925 has 12 divisors (see below), whose sum is σ = 347822356. Its totient is φ = 223632000.

The previous prime is 280020913. The next prime is 280020931. The reversal of 280020925 is 529020082.

It can be written as a sum of positive squares in 6 ways, for example, as 27941796 + 252079129 = 5286^2 + 15877^2 .

It is a de Polignac number, because none of the positive numbers 2^k-280020925 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280020893 and 280020902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5707 + ... + 24343.

Almost surely, 2^280020925 is an apocalyptic number.

280020925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280020925 is a deficient number, since it is larger than the sum of its proper divisors (67801431).

280020925 is a wasteful number, since it uses less digits than its factorization.

280020925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19248 (or 19243 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 280020925 is about 16733.8257729666. The cubic root of 280020925 is about 654.2295585514.

The spelling of 280020925 in words is "two hundred eighty million, twenty thousand, nine hundred twenty-five".