120728636 has 24 divisors (see below), whose sum is σ = 241922016. Its totient is φ = 51641280.

The previous prime is 120728623. The next prime is 120728681. The reversal of 120728636 is 636827021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 120728596 and 120728605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11726 + ... + 19466.

It is an arithmetic number, because the mean of its divisors is an integer number (10080084).

Almost surely, 2^120728636 is an apocalyptic number.

It is an amenable number.

120728636 is an abundant number, since it is smaller than the sum of its proper divisors (121193380).

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

120728636 is a wasteful number, since it uses less digits than its factorization.

120728636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8309 (or 8307 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 120728636 is about 10987.6583492571. The cubic root of 120728636 is about 494.2387182391.

The spelling of 120728636 in words is "one hundred twenty million, seven hundred twenty-eight thousand, six hundred thirty-six".