28530711 has 60 divisors (see below), whose sum is σ = 48665232. Its totient is φ = 16632000.

The previous prime is 28530703. The next prime is 28530721. The reversal of 28530711 is 11703582.

It is not a de Polignac number, because 28530711 - 2³ = 28530703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 401806 + ... + 401876.

Almost surely, 2^28530711 is an apocalyptic number.

28530711 is a deficient number, since it is larger than the sum of its proper divisors (20134521).

28530711 is a wasteful number, since it uses less digits than its factorization.

28530711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 28530711 is about 5341.4147002456. The cubic root of 28530711 is about 305.5654153855.

It can be divided in two parts, 28530 and 711, that added together give a square (29241 = 171²).

The spelling of 28530711 in words is "twenty-eight million, five hundred thirty thousand, seven hundred eleven".