28919149 has 4 divisors (see below), whose sum is σ = 33050464. Its totient is φ = 24787836.

The previous prime is 28919131. The next prime is 28919153. The reversal of 28919149 is 94191982.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94191982 = 2 ⋅47095991.

It is a cyclic number.

It is not a de Polignac number, because 28919149 - 2¹¹ = 28917101 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 (28919129) 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, 2065647 + ... + 2065660.

It is an arithmetic number, because the mean of its divisors is an integer number (8262616).

Almost surely, 2^28919149 is an apocalyptic number.

It is an amenable number.

28919149 is a deficient number, since it is larger than the sum of its proper divisors (4131315).

28919149 is an equidigital number, since it uses as much as digits as its factorization.

28919149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131314.

The product of its digits is 46656, while the sum is 43.

The square root of 28919149 is about 5377.6527407411. The cubic root of 28919149 is about 306.9458997073.

The spelling of 28919149 in words is "twenty-eight million, nine hundred nineteen thousand, one hundred forty-nine".