28471245 has 16 divisors (see below), whose sum is σ = 49695552. Its totient is φ = 13804160.

The previous prime is 28471211. The next prime is 28471249. The reversal of 28471245 is 54217482.

It is not a de Polignac number, because 28471245 - 2¹⁵ = 28438477 is a prime.

It is a super-2 number, since 2×28471245² = 1621223583700050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86112 + ... + 86441.

It is an arithmetic number, because the mean of its divisors is an integer number (3105972).

Almost surely, 2^28471245 is an apocalyptic number.

It is an amenable number.

28471245 is a deficient number, since it is larger than the sum of its proper divisors (21224307).

28471245 is a wasteful number, since it uses less digits than its factorization.

28471245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172572.

The product of its digits is 17920, while the sum is 33.

The square root of 28471245 is about 5335.8452938593. The cubic root of 28471245 is about 305.3529730581.

The spelling of 28471245 in words is "twenty-eight million, four hundred seventy-one thousand, two hundred forty-five".