30126728 has 16 divisors (see below), whose sum is σ = 57007500. Its totient is φ = 14924736.

The previous prime is 30126713. The next prime is 30126731. The reversal of 30126728 is 82762103.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25623844 + 4502884 = 5062^2 + 2122^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30126728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16403 + ... + 18146.

Almost surely, 2^30126728 is an apocalyptic number.

It is an amenable number.

30126728 is a deficient number, since it is larger than the sum of its proper divisors (26880772).

30126728 is a wasteful number, since it uses less digits than its factorization.

30126728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34664 (or 34660 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 30126728 is about 5488.7820142542. The cubic root of 30126728 is about 311.1601619184.

The spelling of 30126728 in words is "thirty million, one hundred twenty-six thousand, seven hundred twenty-eight".