28912735 has 4 divisors (see below), whose sum is σ = 34695288. Its totient is φ = 23130184.

The previous prime is 28912729. The next prime is 28912781. The reversal of 28912735 is 53721982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53721982 = 2 ⋅26860991.

It is a cyclic number.

It is not a de Polignac number, because 28912735 - 2⁷ = 28912607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28912694 and 28912703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891269 + ... + 2891278.

It is an arithmetic number, because the mean of its divisors is an integer number (8673822).

Almost surely, 2^28912735 is an apocalyptic number.

28912735 is a deficient number, since it is larger than the sum of its proper divisors (5782553).

28912735 is an equidigital number, since it uses as much as digits as its factorization.

28912735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782552.

The product of its digits is 30240, while the sum is 37.

The square root of 28912735 is about 5377.0563508299. The cubic root of 28912735 is about 306.9232054414.

The spelling of 28912735 in words is "twenty-eight million, nine hundred twelve thousand, seven hundred thirty-five".