28329493 has 4 divisors (see below), whose sum is σ = 28463968. Its totient is φ = 28195020.

The previous prime is 28329487. The next prime is 28329541. The reversal of 28329493 is 39492382.

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 28329493 - 2⁵ = 28329461 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 (28320493) 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, 66921 + ... + 67342.

It is an arithmetic number, because the mean of its divisors is an integer number (7115992).

Almost surely, 2^28329493 is an apocalyptic number.

It is an amenable number.

28329493 is a deficient number, since it is larger than the sum of its proper divisors (134475).

28329493 is a wasteful number, since it uses less digits than its factorization.

28329493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134474.

The product of its digits is 93312, while the sum is 40.

The square root of 28329493 is about 5322.5457254964. The cubic root of 28329493 is about 304.8453681811.

The spelling of 28329493 in words is "twenty-eight million, three hundred twenty-nine thousand, four hundred ninety-three".