281428625 has 16 divisors (see below), whose sum is σ = 371885904. Its totient is φ = 211897600.

The previous prime is 281428619. The next prime is 281428649. The reversal of 281428625 is 526824182.

It can be written as a sum of positive squares in 8 ways, for example, as 10233601 + 271195024 = 3199^2 + 16468^2 .

It is not a de Polignac number, because 281428625 - 2⁶ = 281428561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64094 + ... + 68343.

It is an arithmetic number, because the mean of its divisors is an integer number (23242869).

Almost surely, 2^281428625 is an apocalyptic number.

281428625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

281428625 is a deficient number, since it is larger than the sum of its proper divisors (90457279).

281428625 is a wasteful number, since it uses less digits than its factorization.

281428625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132469 (or 132459 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 281428625 is about 16775.8345545013. The cubic root of 281428625 is about 655.3240243631.

The spelling of 281428625 in words is "two hundred eighty-one million, four hundred twenty-eight thousand, six hundred twenty-five".