228561725 has 18 divisors (see below), whose sum is σ = 329690394. Its totient is φ = 156727200.

The previous prime is 228561721. The next prime is 228561743. The reversal of 228561725 is 527165822.

It can be written as a sum of positive squares in 3 ways, for example, as 62125924 + 166435801 = 7882^2 + 12901^2 .

It is not a de Polignac number, because 228561725 - 2² = 228561721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228561721) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 92066 + ... + 94515.

It is an arithmetic number, because the mean of its divisors is an integer number (18316133).

Almost surely, 2^228561725 is an apocalyptic number.

228561725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228561725 is a deficient number, since it is larger than the sum of its proper divisors (101128669).

228561725 is a wasteful number, since it uses less digits than its factorization.

228561725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186605 (or 186593 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 228561725 is about 15118.2580015027. The cubic root of 228561725 is about 611.4127650934.

The spelling of 228561725 in words is "two hundred twenty-eight million, five hundred sixty-one thousand, seven hundred twenty-five".