28705392 has 30 divisors (see below), whose sum is σ = 80335632. Its totient is φ = 9568416.

The previous prime is 28705387. The next prime is 28705393. The reversal of 28705392 is 29350782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28705393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99528 + ... + 99815.

Almost surely, 2^28705392 is an apocalyptic number.

It is an amenable number.

28705392 is an abundant number, since it is smaller than the sum of its proper divisors (51630240).

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

28705392 is a wasteful number, since it uses less digits than its factorization.

28705392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199357 (or 199348 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28705392 is about 5357.7413151439. The cubic root of 28705392 is about 306.1877612242.

The spelling of 28705392 in words is "twenty-eight million, seven hundred five thousand, three hundred ninety-two".