7728738 has 16 divisors (see below), whose sum is σ = 15577056. Its totient is φ = 2556320.

The previous prime is 7728709. The next prime is 7728739. The reversal of 7728738 is 8378277.

It is a self number, because there is not a number n which added to its sum of digits gives 7728738.

It is not an unprimeable number, because it can be changed into a prime (7728739) 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, 4131 + ... + 5702.

It is an arithmetic number, because the mean of its divisors is an integer number (973566).

Almost surely, 2^7728738 is an apocalyptic number.

7728738 is an abundant number, since it is smaller than the sum of its proper divisors (7848318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7728738 is a wasteful number, since it uses less digits than its factorization.

7728738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9969.

The product of its digits is 131712, while the sum is 42.

The square root of 7728738 is about 2780.0607907022. The cubic root of 7728738 is about 197.7134412021.

The spelling of 7728738 in words is "seven million, seven hundred twenty-eight thousand, seven hundred thirty-eight".