228072500 has 30 divisors (see below), whose sum is σ = 498754410. Its totient is φ = 91228000.

The previous prime is 228072491. The next prime is 228072503. The reversal of 228072500 is 5270822.

It can be written as a sum of positive squares in 5 ways, for example, as 19963024 + 208109476 = 4468^2 + 14426^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 228072500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228072503) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43115 + ... + 48114.

It is an arithmetic number, because the mean of its divisors is an integer number (16625147).

Almost surely, 2^228072500 is an apocalyptic number.

228072500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228072500 is an abundant number, since it is smaller than the sum of its proper divisors (270681910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228072500 is an equidigital number, since it uses as much as digits as its factorization.

228072500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91253 (or 91236 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 228072500 is about 15102.0693946227. The cubic root of 228072500 is about 610.9762206104.

The spelling of 228072500 in words is "two hundred twenty-eight million, seventy-two thousand, five hundred".