7431728 has 10 divisors (see below), whose sum is σ = 14399004. Its totient is φ = 3715856.

The previous prime is 7431727. The next prime is 7431731. The reversal of 7431728 is 8271347.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7431694 and 7431703.

It is not an unprimeable number, because it can be changed into a prime (7431727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 232226 + ... + 232257.

Almost surely, 2^7431728 is an apocalyptic number.

It is an amenable number.

7431728 is a deficient number, since it is larger than the sum of its proper divisors (6967276).

7431728 is a wasteful number, since it uses less digits than its factorization.

7431728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464491 (or 464485 counting only the distinct ones).

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

The square root of 7431728 is about 2726.1195865185. The cubic root of 7431728 is about 195.1476243516.

The spelling of 7431728 in words is "seven million, four hundred thirty-one thousand, seven hundred twenty-eight".