123428220 has 24 divisors (see below), whose sum is σ = 345599184. Its totient is φ = 32914176.

The previous prime is 123428213. The next prime is 123428231. The reversal of 123428220 is 22824321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028509 + ... + 1028628.

It is an arithmetic number, because the mean of its divisors is an integer number (14399966).

Almost surely, 2^123428220 is an apocalyptic number.

123428220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123428220 is an abundant number, since it is smaller than the sum of its proper divisors (222170964).

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

123428220 is a wasteful number, since it uses less digits than its factorization.

123428220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057149 (or 2057147 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 123428220 is about 11109.8253811660. The cubic root of 123428220 is about 497.8954474792.

The spelling of 123428220 in words is "one hundred twenty-three million, four hundred twenty-eight thousand, two hundred twenty".