28723634 has 8 divisors (see below), whose sum is σ = 43124508. Its totient is φ = 14348800.

The previous prime is 28723633. The next prime is 28723663. The reversal of 28723634 is 43632782.

It can be written as a sum of positive squares in 2 ways, for example, as 28590409 + 133225 = 5347^2 + 365^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28723594 and 28723603.

It is not an unprimeable number, because it can be changed into a prime (28723633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3467 + ... + 8334.

Almost surely, 2^28723634 is an apocalyptic number.

28723634 is a deficient number, since it is larger than the sum of its proper divisors (14400874).

28723634 is a wasteful number, since it uses less digits than its factorization.

28723634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020.

The product of its digits is 48384, while the sum is 35.

The square root of 28723634 is about 5359.4434412540. The cubic root of 28723634 is about 306.2526072803.

The spelling of 28723634 in words is "twenty-eight million, seven hundred twenty-three thousand, six hundred thirty-four".