123578028 has 96 divisors (see below), whose sum is σ = 378040320. Its totient is φ = 34162560.

The previous prime is 123578023. The next prime is 123578051. The reversal of 123578028 is 820875321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123577983 and 123578001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123578023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20800 + ... + 26072.

It is an arithmetic number, because the mean of its divisors is an integer number (3937920).

Almost surely, 2^123578028 is an apocalyptic number.

123578028 is a gapful number since it is divisible by the number (18) 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 123578028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189020160).

123578028 is an abundant number, since it is smaller than the sum of its proper divisors (254462292).

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

123578028 is a wasteful number, since it uses less digits than its factorization.

123578028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5324 (or 5316 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 123578028 is about 11116.5654768008. The cubic root of 123578028 is about 498.0968022012.

The spelling of 123578028 in words is "one hundred twenty-three million, five hundred seventy-eight thousand, twenty-eight".