228120825 has 12 divisors (see below), whose sum is σ = 377159888. Its totient is φ = 121664400.

The previous prime is 228120811. The next prime is 228120833. The reversal of 228120825 is 528021822.

It is not a de Polignac number, because 228120825 - 2⁵ = 228120793 is a prime.

It is a super-2 number, since 2×228120825² = 104078221597361250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 228120792 and 228120801.

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, 1520731 + ... + 1520880.

Almost surely, 2^228120825 is an apocalyptic number.

228120825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228120825 is a deficient number, since it is larger than the sum of its proper divisors (149039063).

228120825 is a wasteful number, since it uses less digits than its factorization.

228120825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041624 (or 3041619 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 228120825 is about 15103.6692561775. The cubic root of 228120825 is about 611.0193696687.

The spelling of 228120825 in words is "two hundred twenty-eight million, one hundred twenty thousand, eight hundred twenty-five".