28432613 has 8 divisors (see below), whose sum is σ = 31856160. Its totient is φ = 25148880.

The previous prime is 28432609. The next prime is 28432637. The reversal of 28432613 is 31623482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28432613 - 2² = 28432609 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 (28432643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34523 + ... + 35336.

It is an arithmetic number, because the mean of its divisors is an integer number (3982020).

Almost surely, 2^28432613 is an apocalyptic number.

It is an amenable number.

28432613 is a deficient number, since it is larger than the sum of its proper divisors (3423547).

28432613 is a wasteful number, since it uses less digits than its factorization.

28432613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69907.

The product of its digits is 6912, while the sum is 29.

The square root of 28432613 is about 5332.2240200502. The cubic root of 28432613 is about 305.2148016562.

The spelling of 28432613 in words is "twenty-eight million, four hundred thirty-two thousand, six hundred thirteen".