7478728 has 24 divisors (see below), whose sum is σ = 14460390. Its totient is φ = 3624000.

The previous prime is 7478717. The next prime is 7478729. The reversal of 7478728 is 8278747.

It can be written as a sum of positive squares in only one way, i.e., 7387524 + 91204 = 2718^2 + 302^2 .

It is not an unprimeable number, because it can be changed into a prime (7478729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49453 + ... + 49603.

Almost surely, 2^7478728 is an apocalyptic number.

It is an amenable number.

7478728 is a deficient number, since it is larger than the sum of its proper divisors (6981662).

7478728 is a wasteful number, since it uses less digits than its factorization.

7478728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 194 counting only the distinct ones).

The product of its digits is 175616, while the sum is 43.

The square root of 7478728 is about 2734.7263117175. The cubic root of 7478728 is about 195.5581466790.

The spelling of 7478728 in words is "seven million, four hundred seventy-eight thousand, seven hundred twenty-eight".