28723436 has 48 divisors (see below), whose sum is σ = 59496192. Its totient is φ = 11880000.

The previous prime is 28723423. The next prime is 28723447. The reversal of 28723436 is 63432782.

It is a junction number, because it is equal to n+sod(n) for n = 28723396 and 28723405.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 114311 + ... + 114561.

It is an arithmetic number, because the mean of its divisors is an integer number (1239504).

Almost surely, 2^28723436 is an apocalyptic number.

It is an amenable number.

28723436 is an abundant number, since it is smaller than the sum of its proper divisors (30772756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28723436 is a wasteful number, since it uses less digits than its factorization.

28723436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 388 counting only the distinct ones).

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

The square root of 28723436 is about 5359.4249691548. The cubic root of 28723436 is about 306.2519035839.

The spelling of 28723436 in words is "twenty-eight million, seven hundred twenty-three thousand, four hundred thirty-six".