728473393 has 4 divisors (see below), whose sum is σ = 742218228. Its totient is φ = 714728560.

The previous prime is 728473387. The next prime is 728473399. The reversal of 728473393 is 393374827.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (728473387) and next prime (728473399).

It can be written as a sum of positive squares in 2 ways, for example, as 384630544 + 343842849 = 19612^2 + 18543^2 .

It is a cyclic number.

It is not a de Polignac number, because 728473393 - 2¹³ = 728465201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728473399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6872338 + ... + 6872443.

It is an arithmetic number, because the mean of its divisors is an integer number (185554557).

Almost surely, 2^728473393 is an apocalyptic number.

It is an amenable number.

728473393 is a deficient number, since it is larger than the sum of its proper divisors (13744835).

728473393 is a wasteful number, since it uses less digits than its factorization.

728473393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13744834.

The product of its digits is 762048, while the sum is 46.

The square root of 728473393 is about 26990.2462567499. The cubic root of 728473393 is about 899.7832370978.

The spelling of 728473393 in words is "seven hundred twenty-eight million, four hundred seventy-three thousand, three hundred ninety-three".