728347507 has 8 divisors (see below), whose sum is σ = 784263600. Its totient is φ = 673883904.

The previous prime is 728347471. The next prime is 728347513. The reversal of 728347507 is 705743827.

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 728347507 - 2⁷ = 728347379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728347517) 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, 362082 + ... + 364087.

It is an arithmetic number, because the mean of its divisors is an integer number (98032950).

Almost surely, 2^728347507 is an apocalyptic number.

728347507 is a deficient number, since it is larger than the sum of its proper divisors (55916093).

728347507 is a wasteful number, since it uses less digits than its factorization.

728347507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726245.

The product of its (nonzero) digits is 329280, while the sum is 43.

The square root of 728347507 is about 26987.9140913113. The cubic root of 728347507 is about 899.7314042104.

The spelling of 728347507 in words is "seven hundred twenty-eight million, three hundred forty-seven thousand, five hundred seven".