28497447 has 32 divisors (see below), whose sum is σ = 46368000. Its totient is φ = 17154720.

The previous prime is 28497421. The next prime is 28497451. The reversal of 28497447 is 74479482.

It is not a de Polignac number, because 28497447 - 2¹⁰ = 28496423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28497407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67804 + ... + 68222.

It is an arithmetic number, because the mean of its divisors is an integer number (1449000).

Almost surely, 2^28497447 is an apocalyptic number.

28497447 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28497447 is a deficient number, since it is larger than the sum of its proper divisors (17870553).

28497447 is a wasteful number, since it uses less digits than its factorization.

28497447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 662 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 28497447 is about 5338.3000103029. The cubic root of 28497447 is about 305.4466161410.

It can be divided in two parts, 2849 and 7447, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 28497447 in words is "twenty-eight million, four hundred ninety-seven thousand, four hundred forty-seven".