28191052 has 12 divisors (see below), whose sum is σ = 49381920. Its totient is φ = 14081936.

The previous prime is 28191011. The next prime is 28191091. The reversal of 28191052 is 25019182.

It is a self number, because there is not a number n which added to its sum of digits gives 28191052.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2349 + ... + 7867.

It is an arithmetic number, because the mean of its divisors is an integer number (4115160).

Almost surely, 2^28191052 is an apocalyptic number.

It is an amenable number.

28191052 is a deficient number, since it is larger than the sum of its proper divisors (21190868).

28191052 is a wasteful number, since it uses less digits than its factorization.

28191052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800 (or 6798 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 28191052 is about 5309.5246491565. The cubic root of 28191052 is about 304.3479827518.

The spelling of 28191052 in words is "twenty-eight million, one hundred ninety-one thousand, fifty-two".