228425121428 has 72 divisors (see below), whose sum is σ = 491226583680. Its totient is φ = 92413560960.

The previous prime is 228425121413. The next prime is 228425121443. The reversal of 228425121428 is 824121524822.

It is an interprime number because it is at equal distance from previous prime (228425121413) and next prime (228425121443).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 937301 + ... + 1155587.

It is an arithmetic number, because the mean of its divisors is an integer number (6822591440).

Almost surely, 2^228425121428 is an apocalyptic number.

228425121428 is a gapful number since it is divisible by the number (28) 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 228425121428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245613291840).

228425121428 is an abundant number, since it is smaller than the sum of its proper divisors (262801462252).

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

228425121428 is a wasteful number, since it uses less digits than its factorization.

228425121428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218605 (or 218596 counting only the distinct ones).

The product of its digits is 163840, while the sum is 41.

The spelling of 228425121428 in words is "two hundred twenty-eight billion, four hundred twenty-five million, one hundred twenty-one thousand, four hundred twenty-eight".