228215040 has 144 divisors (see below), whose sum is σ = 737213568. Its totient is φ = 60162048.

The previous prime is 228215017. The next prime is 228215041. The reversal of 228215040 is 40512822.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 228215040.

It is not an unprimeable number, because it can be changed into a prime (228215041) 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, 395232 + ... + 395808.

Almost surely, 2^228215040 is an apocalyptic number.

228215040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228215040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368606784).

228215040 is an abundant number, since it is smaller than the sum of its proper divisors (508998528).

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

228215040 is a wasteful number, since it uses less digits than its factorization.

228215040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 228215040 is about 15106.7878783016. The cubic root of 228215040 is about 611.1034760723.

Adding to 228215040 its reverse (40512822), we get a palindrome (268727862).

The spelling of 228215040 in words is "two hundred twenty-eight million, two hundred fifteen thousand, forty".