120728820 has 24 divisors (see below), whose sum is σ = 338040864. Its totient is φ = 32194336.

The previous prime is 120728813. The next prime is 120728833. The reversal of 120728820 is 28827021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1006014 + ... + 1006133.

It is an arithmetic number, because the mean of its divisors is an integer number (14085036).

Almost surely, 2^120728820 is an apocalyptic number.

120728820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120728820 is an abundant number, since it is smaller than the sum of its proper divisors (217312044).

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

120728820 is a wasteful number, since it uses less digits than its factorization.

120728820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012159 (or 2012157 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 120728820 is about 10987.6667222846. Note that the first 3 decimals coincide. The cubic root of 120728820 is about 494.2389693252.

The spelling of 120728820 in words is "one hundred twenty million, seven hundred twenty-eight thousand, eight hundred twenty".