28737533 has 4 divisors (see below), whose sum is σ = 31350048. Its totient is φ = 26125020.

The previous prime is 28737529. The next prime is 28737547. The reversal of 28737533 is 33573782.

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 28737533 - 2² = 28737529 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 (28737503) 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, 1306241 + ... + 1306262.

It is an arithmetic number, because the mean of its divisors is an integer number (7837512).

Almost surely, 2^28737533 is an apocalyptic number.

It is an amenable number.

28737533 is a deficient number, since it is larger than the sum of its proper divisors (2612515).

28737533 is a wasteful number, since it uses less digits than its factorization.

28737533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612514.

The product of its digits is 105840, while the sum is 38.

The square root of 28737533 is about 5360.7399675791. The cubic root of 28737533 is about 306.3019965579.

The spelling of 28737533 in words is "twenty-eight million, seven hundred thirty-seven thousand, five hundred thirty-three".