30486728 has 8 divisors (see below), whose sum is σ = 57162630. Its totient is φ = 15243360.

The previous prime is 30486721. The next prime is 30486737. The reversal of 30486728 is 82768403.

It can be written as a sum of positive squares in only one way, i.e., 26234884 + 4251844 = 5122^2 + 2062^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 30486691 and 30486700.

It is not an unprimeable number, because it can be changed into a prime (30486721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1905413 + ... + 1905428.

Almost surely, 2^30486728 is an apocalyptic number.

It is an amenable number.

30486728 is a deficient number, since it is larger than the sum of its proper divisors (26675902).

30486728 is a wasteful number, since it uses less digits than its factorization.

30486728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810847 (or 3810843 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 30486728 is about 5521.4787874264. The cubic root of 30486728 is about 312.3946627370.

The spelling of 30486728 in words is "thirty million, four hundred eighty-six thousand, seven hundred twenty-eight".