728007842 has 4 divisors (see below), whose sum is σ = 1092011766. Its totient is φ = 364003920.

The previous prime is 728007823. The next prime is 728007853. The reversal of 728007842 is 248700827.

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

It can be written as a sum of positive squares in only one way, i.e., 722480641 + 5527201 = 26879^2 + 2351^2 .

It is a junction number, because it is equal to n+sod(n) for n = 728007796 and 728007805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182001959 + ... + 182001962.

Almost surely, 2^728007842 is an apocalyptic number.

728007842 is a deficient number, since it is larger than the sum of its proper divisors (364003924).

728007842 is a wasteful number, since it uses less digits than its factorization.

728007842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364003923.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 728007842 is about 26981.6204480013. The cubic root of 728007842 is about 899.5915191586.

The spelling of 728007842 in words is "seven hundred twenty-eight million, seven thousand, eight hundred forty-two".