728773861 has 8 divisors (see below), whose sum is σ = 767565920. Its totient is φ = 690025392.

The previous prime is 728773831. The next prime is 728773889. The reversal of 728773861 is 168377827.

728773861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 728773861 - 2⁷ = 728773733 is a prime.

It is a super-2 number, since 2×728773861² = 1062222680953694642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728773831) 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, 26806 + ... + 46648.

It is an arithmetic number, because the mean of its divisors is an integer number (95945740).

Almost surely, 2^728773861 is an apocalyptic number.

It is an amenable number.

728773861 is a deficient number, since it is larger than the sum of its proper divisors (38792059).

728773861 is a wasteful number, since it uses less digits than its factorization.

728773861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21795.

The product of its digits is 790272, while the sum is 49.

The square root of 728773861 is about 26995.8119159250. The cubic root of 728773861 is about 899.9069290588.

The spelling of 728773861 in words is "seven hundred twenty-eight million, seven hundred seventy-three thousand, eight hundred sixty-one".