28434723 has 8 divisors (see below), whose sum is σ = 38534736. Its totient is φ = 18645600.

The previous prime is 28434691. The next prime is 28434767. The reversal of 28434723 is 32743482.

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

It is not a de Polignac number, because 28434723 - 2⁵ = 28434691 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28434323) 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, 77508 + ... + 77873.

It is an arithmetic number, because the mean of its divisors is an integer number (4816842).

Almost surely, 2^28434723 is an apocalyptic number.

28434723 is a deficient number, since it is larger than the sum of its proper divisors (10100013).

28434723 is a wasteful number, since it uses less digits than its factorization.

28434723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155445.

The product of its digits is 32256, while the sum is 33.

The square root of 28434723 is about 5332.4218700324. The cubic root of 28434723 is about 305.2223515228. Note that the first 3 decimals are identical.

The spelling of 28434723 in words is "twenty-eight million, four hundred thirty-four thousand, seven hundred twenty-three".