120728491 has 4 divisors (see below), whose sum is σ = 130015312. Its totient is φ = 111441672.

The previous prime is 120728483. The next prime is 120728497. The reversal of 120728491 is 194827021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194827021 = 17 ⋅11460413.

It is a cyclic number.

It is not a de Polignac number, because 120728491 - 2³ = 120728483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120728497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4643391 + ... + 4643416.

It is an arithmetic number, because the mean of its divisors is an integer number (32503828).

Almost surely, 2^120728491 is an apocalyptic number.

120728491 is a deficient number, since it is larger than the sum of its proper divisors (9286821).

120728491 is an equidigital number, since it uses as much as digits as its factorization.

120728491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9286820.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 120728491 is about 10987.6517509430. The cubic root of 120728491 is about 494.2385203720.

The spelling of 120728491 in words is "one hundred twenty million, seven hundred twenty-eight thousand, four hundred ninety-one".