28737249 has 4 divisors (see below), whose sum is σ = 38316336. Its totient is φ = 19158164.

The previous prime is 28737239. The next prime is 28737251. The reversal of 28737249 is 94273782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28737249 - 2¹² = 28733153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28737249.

It is not an unprimeable number, because it can be changed into a prime (28737239) 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, 4789539 + ... + 4789544.

It is an arithmetic number, because the mean of its divisors is an integer number (9579084).

Almost surely, 2^28737249 is an apocalyptic number.

It is an amenable number.

28737249 is a deficient number, since it is larger than the sum of its proper divisors (9579087).

28737249 is an equidigital number, since it uses as much as digits as its factorization.

28737249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9579086.

The product of its digits is 169344, while the sum is 42.

The square root of 28737249 is about 5360.7134786332. The cubic root of 28737249 is about 306.3009875400.

The spelling of 28737249 in words is "twenty-eight million, seven hundred thirty-seven thousand, two hundred forty-nine".