28919461 has 4 divisors (see below), whose sum is σ = 29315692. Its totient is φ = 28523232.

The previous prime is 28919453. The next prime is 28919479. The reversal of 28919461 is 16491982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 7667361 = 4610^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 28919461 - 2³ = 28919453 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 (28919161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198006 + ... + 198151.

It is an arithmetic number, because the mean of its divisors is an integer number (7328923).

Almost surely, 2^28919461 is an apocalyptic number.

It is an amenable number.

28919461 is a deficient number, since it is larger than the sum of its proper divisors (396231).

28919461 is an equidigital number, since it uses as much as digits as its factorization.

28919461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396230.

The product of its digits is 31104, while the sum is 40.

The square root of 28919461 is about 5377.6817496018. The cubic root of 28919461 is about 306.9470035523.

The spelling of 28919461 in words is "twenty-eight million, nine hundred nineteen thousand, four hundred sixty-one".