28434247 has 4 divisors (see below), whose sum is σ = 28559736. Its totient is φ = 28308760.

The previous prime is 28434199. The next prime is 28434253. The reversal of 28434247 is 74243482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28434247 - 2¹¹ = 28432199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28434277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62404 + ... + 62857.

It is an arithmetic number, because the mean of its divisors is an integer number (7139934).

Almost surely, 2^28434247 is an apocalyptic number.

28434247 is a deficient number, since it is larger than the sum of its proper divisors (125489).

28434247 is a wasteful number, since it uses less digits than its factorization.

28434247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125488.

The product of its digits is 43008, while the sum is 34.

The square root of 28434247 is about 5332.3772372179. The cubic root of 28434247 is about 305.2206483628.

The spelling of 28434247 in words is "twenty-eight million, four hundred thirty-four thousand, two hundred forty-seven".