28248649 has 32 divisors (see below), whose sum is σ = 36005760. Its totient is φ = 21772800.

The previous prime is 28248643. The next prime is 28248683. The reversal of 28248649 is 94684282.

It is a cyclic number.

It is not a de Polignac number, because 28248649 - 2³ = 28248641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28248641) 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, 100389 + ... + 100669.

It is an arithmetic number, because the mean of its divisors is an integer number (1125180).

Almost surely, 2^28248649 is an apocalyptic number.

It is an amenable number.

28248649 is a deficient number, since it is larger than the sum of its proper divisors (7757111).

28248649 is a wasteful number, since it uses less digits than its factorization.

28248649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 221184, while the sum is 43.

The square root of 28248649 is about 5314.9458134585. The cubic root of 28248649 is about 304.5551123773. Note that the first 3 decimals are identical.

The spelling of 28248649 in words is "twenty-eight million, two hundred forty-eight thousand, six hundred forty-nine".