728042540 has 12 divisors (see below), whose sum is σ = 1528889376. Its totient is φ = 291217008.

The previous prime is 728042519. The next prime is 728042563. The reversal of 728042540 is 45240827.

It is a hoax number, since the sum of its digits (32) 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 = 728042497 and 728042506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18201044 + ... + 18201083.

It is an arithmetic number, because the mean of its divisors is an integer number (127407448).

Almost surely, 2^728042540 is an apocalyptic number.

It is an amenable number.

728042540 is an abundant number, since it is smaller than the sum of its proper divisors (800846836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728042540 is a wasteful number, since it uses less digits than its factorization.

728042540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36402136 (or 36402134 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 728042540 is about 26982.2634335965. The cubic root of 728042540 is about 899.6058109143.

The spelling of 728042540 in words is "seven hundred twenty-eight million, forty-two thousand, five hundred forty".