28793537 has 4 divisors (see below), whose sum is σ = 28922880. Its totient is φ = 28664196.

The previous prime is 28793497. The next prime is 28793551. The reversal of 28793537 is 73539782.

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 28793537 - 2⁶ = 28793473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28793587) 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, 64337 + ... + 64782.

It is an arithmetic number, because the mean of its divisors is an integer number (7230720).

Almost surely, 2^28793537 is an apocalyptic number.

It is an amenable number.

28793537 is a deficient number, since it is larger than the sum of its proper divisors (129343).

28793537 is a wasteful number, since it uses less digits than its factorization.

28793537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129342.

The product of its digits is 317520, while the sum is 44.

The square root of 28793537 is about 5365.9609577409. The cubic root of 28793537 is about 306.5008422705.

The spelling of 28793537 in words is "twenty-eight million, seven hundred ninety-three thousand, five hundred thirty-seven".