28439736 has 32 divisors (see below), whose sum is σ = 76569360. Its totient is φ = 8750592.

The previous prime is 28439731. The next prime is 28439743. The reversal of 28439736 is 63793482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28439731) 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, 45265 + ... + 45888.

Almost surely, 2^28439736 is an apocalyptic number.

28439736 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28439736 is an abundant number, since it is smaller than the sum of its proper divisors (48129624).

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

28439736 is a wasteful number, since it uses less digits than its factorization.

28439736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91175 (or 91171 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 28439736 is about 5332.8918983981. The cubic root of 28439736 is about 305.2402872199.

The spelling of 28439736 in words is "twenty-eight million, four hundred thirty-nine thousand, seven hundred thirty-six".