28870471 has 32 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 22104576.

The previous prime is 28870469. The next prime is 28870477. The reversal of 28870471 is 17407882.

It is a cyclic number.

It is not a de Polignac number, because 28870471 - 2¹ = 28870469 is a prime.

It is a super-3 number, since 3×28870471³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 28870471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870477) 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 31 ways as a sum of consecutive naturals, for example, 347796 + ... + 347878.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^28870471 is an apocalyptic number.

28870471 is a deficient number, since it is larger than the sum of its proper divisors (7901369).

28870471 is a wasteful number, since it uses less digits than its factorization.

28870471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 28870471 is about 5373.1248822264. The cubic root of 28870471 is about 306.7735813153.

The spelling of 28870471 in words is "twenty-eight million, eight hundred seventy thousand, four hundred seventy-one".