7728730438 has 16 divisors (see below), whose sum is σ = 13619861136. Its totient is φ = 3242823840.

The previous prime is 7728730409. The next prime is 7728730447. The reversal of 7728730438 is 8340378277.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7728730391 and 7728730400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13511481 + ... + 13512052.

It is an arithmetic number, because the mean of its divisors is an integer number (851241321).

Almost surely, 2^7728730438 is an apocalyptic number.

7728730438 is a deficient number, since it is larger than the sum of its proper divisors (5891130698).

7728730438 is a wasteful number, since it uses less digits than its factorization.

7728730438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27023559.

The product of its (nonzero) digits is 1580544, while the sum is 49.

The square root of 7728730438 is about 87913.1983151563. The cubic root of 7728730438 is about 1977.1337671939.

The spelling of 7728730438 in words is "seven billion, seven hundred twenty-eight million, seven hundred thirty thousand, four hundred thirty-eight".