123578820 has 72 divisors (see below), whose sum is σ = 380487744. Its totient is φ = 32459328.

The previous prime is 123578789. The next prime is 123578857. The reversal of 123578820 is 28875321.

123578820 is a `hidden beast` number, since 1 + 2 + 3 + 578 + 82 + 0 = 666.

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

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, 6937 + ... + 17183.

It is an arithmetic number, because the mean of its divisors is an integer number (5284552).

Almost surely, 2^123578820 is an apocalyptic number.

123578820 is a gapful number since it is divisible by the number (10) 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 123578820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190243872).

123578820 is an abundant number, since it is smaller than the sum of its proper divisors (256908924).

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

123578820 is a wasteful number, since it uses less digits than its factorization.

123578820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329 (or 10324 counting only the distinct ones).

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

The square root of 123578820 is about 11116.6010992569. The cubic root of 123578820 is about 498.0978662842.

The spelling of 123578820 in words is "one hundred twenty-three million, five hundred seventy-eight thousand, eight hundred twenty".