28424247 has 16 divisors (see below), whose sum is σ = 40824960. Its totient is φ = 17533152.

The previous prime is 28424243. The next prime is 28424287. The reversal of 28424247 is 74242482.

It is not a de Polignac number, because 28424247 - 2² = 28424243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28424243) 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, 3348 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (2551560).

Almost surely, 2^28424247 is an apocalyptic number.

28424247 is a deficient number, since it is larger than the sum of its proper divisors (12400713).

28424247 is a wasteful number, since it uses less digits than its factorization.

28424247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11662.

The product of its digits is 28672, while the sum is 33.

The square root of 28424247 is about 5331.4394866677. The cubic root of 28424247 is about 305.1848632951.

It can be divided in two parts, 284 and 24247, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 28424247 in words is "twenty-eight million, four hundred twenty-four thousand, two hundred forty-seven".