728165835 has 32 divisors (see below), whose sum is σ = 1299946560. Its totient is φ = 386726400.

The previous prime is 728165819. The next prime is 728165839. The reversal of 728165835 is 538561827.

It is not a de Polignac number, because 728165835 - 2⁴ = 728165819 is a prime.

It is a super-2 number, since 2×728165835² = 1060450966522494450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (728165839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21345 + ... + 43725.

It is an arithmetic number, because the mean of its divisors is an integer number (40623330).

Almost surely, 2^728165835 is an apocalyptic number.

728165835 is a deficient number, since it is larger than the sum of its proper divisors (571780725).

728165835 is a wasteful number, since it uses less digits than its factorization.

728165835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22636 (or 22630 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 728165835 is about 26984.5480784837. The cubic root of 728165835 is about 899.6565912060.

It can be divided in two parts, 728165 and 835, that added together give a cube (729000 = 90³).

The spelling of 728165835 in words is "seven hundred twenty-eight million, one hundred sixty-five thousand, eight hundred thirty-five".