728792121 has 8 divisors (see below), whose sum is σ = 972731584. Its totient is φ = 485357040.

The previous prime is 728792117. The next prime is 728792171. The reversal of 728792121 is 121297827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728792121 - 2² = 728792117 is a prime.

It is a super-2 number, since 2×728792121² = 1062275911263357282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 728792121.

It is not an unprimeable number, because it can be changed into a prime (728792171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122710 + ... + 128511.

It is an arithmetic number, because the mean of its divisors is an integer number (121591448).

Almost surely, 2^728792121 is an apocalyptic number.

It is an amenable number.

728792121 is a deficient number, since it is larger than the sum of its proper divisors (243939463).

728792121 is a wasteful number, since it uses less digits than its factorization.

728792121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252191.

The product of its digits is 28224, while the sum is 39.

The square root of 728792121 is about 26996.1501144145. The cubic root of 728792121 is about 899.9144449537.

The spelling of 728792121 in words is "seven hundred twenty-eight million, seven hundred ninety-two thousand, one hundred twenty-one".