28901439 has 24 divisors (see below), whose sum is σ = 48322560. Its totient is φ = 16303248.

The previous prime is 28901419. The next prime is 28901497. The reversal of 28901439 is 93410982.

It is not a de Polignac number, because 28901439 - 2⁷ = 28901311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28901419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2074 + ... + 7880.

It is an arithmetic number, because the mean of its divisors is an integer number (2013440).

Almost surely, 2^28901439 is an apocalyptic number.

28901439 is a deficient number, since it is larger than the sum of its proper divisors (19421121).

28901439 is a wasteful number, since it uses less digits than its factorization.

28901439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899 (or 5896 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28901439 is about 5376.0058593718. The cubic root of 28901439 is about 306.8832293301.

The spelling of 28901439 in words is "twenty-eight million, nine hundred one thousand, four hundred thirty-nine".