728378045 has 8 divisors (see below), whose sum is σ = 874201560. Its totient is φ = 582603840.

The previous prime is 728378033. The next prime is 728378059. The reversal of 728378045 is 540873827.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 187443481 + 540934564 = 13691^2 + 23258^2 .

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

It is not a de Polignac number, because 728378045 - 2⁶ = 728377981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728377987 and 728378005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41735 + ... + 56555.

It is an arithmetic number, because the mean of its divisors is an integer number (109275195).

Almost surely, 2^728378045 is an apocalyptic number.

It is an amenable number.

728378045 is a deficient number, since it is larger than the sum of its proper divisors (145823515).

728378045 is a wasteful number, since it uses less digits than its factorization.

728378045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24655.

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 728378045 is about 26988.4798571539. The cubic root of 728378045 is about 899.7439786173.

The spelling of 728378045 in words is "seven hundred twenty-eight million, three hundred seventy-eight thousand, forty-five".