228915820 has 48 divisors (see below), whose sum is σ = 550787328. Its totient is φ = 78287040.

The previous prime is 228915779. The next prime is 228915823. The reversal of 228915820 is 28519822.

228915820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 228915820.

It is not an unprimeable number, because it can be changed into a prime (228915823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60175 + ... + 63865.

It is an arithmetic number, because the mean of its divisors is an integer number (11474736).

Almost surely, 2^228915820 is an apocalyptic number.

228915820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228915820 is an abundant number, since it is smaller than the sum of its proper divisors (321871508).

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

228915820 is a wasteful number, since it uses less digits than its factorization.

228915820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150 (or 4148 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 228915820 is about 15129.9643092771. The cubic root of 228915820 is about 611.7283421324.

The spelling of 228915820 in words is "two hundred twenty-eight million, nine hundred fifteen thousand, eight hundred twenty".