28723635 has 12 divisors (see below), whose sum is σ = 49787712. Its totient is φ = 15319248.

The previous prime is 28723633. The next prime is 28723663. The reversal of 28723635 is 53632782.

It is not a de Polignac number, because 28723635 - 2¹ = 28723633 is a prime.

It is a super-2 number, since 2×28723635² = 1650094415226450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28723635.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319107 + ... + 319196.

It is an arithmetic number, because the mean of its divisors is an integer number (4148976).

Almost surely, 2^28723635 is an apocalyptic number.

28723635 is a deficient number, since it is larger than the sum of its proper divisors (21064077).

28723635 is a wasteful number, since it uses less digits than its factorization.

28723635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638314 (or 638311 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 28723635 is about 5359.4435345472. The cubic root of 28723635 is about 306.2526108343.

The spelling of 28723635 in words is "twenty-eight million, seven hundred twenty-three thousand, six hundred thirty-five".