28737193 has 4 divisors (see below), whose sum is σ = 28909440. Its totient is φ = 28564948.

The previous prime is 28737169. The next prime is 28737211. The reversal of 28737193 is 39173782.

It is the 2189-th star 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.

It is a cyclic number.

It is not a de Polignac number, because 28737193 - 2²¹ = 26640041 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28737113) 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, 85873 + ... + 86206.

It is an arithmetic number, because the mean of its divisors is an integer number (7227360).

Almost surely, 2^28737193 is an apocalyptic number.

It is an amenable number.

28737193 is a deficient number, since it is larger than the sum of its proper divisors (172247).

28737193 is a wasteful number, since it uses less digits than its factorization.

28737193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172246.

The product of its digits is 63504, while the sum is 40.

The square root of 28737193 is about 5360.7082554454. The cubic root of 28737193 is about 306.3007885780.

The spelling of 28737193 in words is "twenty-eight million, seven hundred thirty-seven thousand, one hundred ninety-three".