228870138 has 16 divisors (see below), whose sum is σ = 523131840. Its totient is φ = 65391456.

The previous prime is 228870137. The next prime is 228870139. The reversal of 228870138 is 831078822.

It is an interprime number because it is at equal distance from previous prime (228870137) and next prime (228870139).

It is a junction number, because it is equal to n+sod(n) for n = 228870096 and 228870105.

It is not an unprimeable number, because it can be changed into a prime (228870137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2724603 + ... + 2724686.

It is an arithmetic number, because the mean of its divisors is an integer number (32695740).

Almost surely, 2^228870138 is an apocalyptic number.

228870138 is an abundant number, since it is smaller than the sum of its proper divisors (294261702).

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

228870138 is a wasteful number, since it uses less digits than its factorization.

228870138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5449301.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 228870138 is about 15128.4545806900. The cubic root of 228870138 is about 611.6876476489.

The spelling of 228870138 in words is "two hundred twenty-eight million, eight hundred seventy thousand, one hundred thirty-eight".