728051643 has 24 divisors (see below), whose sum is σ = 1153891440. Its totient is φ = 438682560.

The previous prime is 728051629. The next prime is 728051659. The reversal of 728051643 is 346150827.

728051643 is a `hidden beast` number, since 7 + 2 + 8 + 0 + 5 + 1 + 643 = 666.

It is not a de Polignac number, because 728051643 - 2⁶ = 728051579 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 728051598 and 728051607.

It is not an unprimeable number, because it can be changed into a prime (728051243) 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 23 ways as a sum of consecutive naturals, for example, 4128 + ... + 38381.

It is an arithmetic number, because the mean of its divisors is an integer number (48078810).

Almost surely, 2^728051643 is an apocalyptic number.

728051643 is a deficient number, since it is larger than the sum of its proper divisors (425839797).

728051643 is a wasteful number, since it uses less digits than its factorization.

728051643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42699 (or 42696 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 728051643 is about 26982.4321179541. The cubic root of 728051643 is about 899.6095602728.

The spelling of 728051643 in words is "seven hundred twenty-eight million, fifty-one thousand, six hundred forty-three".