728031407 has 4 divisors (see below), whose sum is σ = 730372656. Its totient is φ = 725690160.

The previous prime is 728031391. The next prime is 728031419. The reversal of 728031407 is 704130827.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 728031407 - 2⁴ = 728031391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728031467) 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, 1170158 + ... + 1170779.

It is an arithmetic number, because the mean of its divisors is an integer number (182593164).

Almost surely, 2^728031407 is an apocalyptic number.

728031407 is a deficient number, since it is larger than the sum of its proper divisors (2341249).

728031407 is a wasteful number, since it uses less digits than its factorization.

728031407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341248.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 728031407 is about 26982.0571306192. The cubic root of 728031407 is about 899.6012253935.

The spelling of 728031407 in words is "seven hundred twenty-eight million, thirty-one thousand, four hundred seven".