280742025 has 24 divisors (see below), whose sum is σ = 484344000. Its totient is φ = 143218240.

The previous prime is 280742017. The next prime is 280742027. The reversal of 280742025 is 520247082.

It is not a de Polignac number, because 280742025 - 2³ = 280742017 is a prime.

It is a super-2 number, since 2×280742025² = 157632169202201250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280741983 and 280742001.

It is not an unprimeable number, because it can be changed into a prime (280742027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79650 + ... + 83099.

It is an arithmetic number, because the mean of its divisors is an integer number (20181000).

Almost surely, 2^280742025 is an apocalyptic number.

280742025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280742025 is a deficient number, since it is larger than the sum of its proper divisors (203601975).

280742025 is a wasteful number, since it uses less digits than its factorization.

280742025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162785 (or 162780 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 280742025 is about 16755.3580982323. The cubic root of 280742025 is about 654.7906601376.

The spelling of 280742025 in words is "two hundred eighty million, seven hundred forty-two thousand, twenty-five".