28740538 has 8 divisors (see below), whose sum is σ = 43701588. Its totient is φ = 14173344.

The previous prime is 28740529. The next prime is 28740539. The reversal of 28740538 is 83504782.

It can be written as a sum of positive squares in 2 ways, for example, as 28376929 + 363609 = 5327^2 + 603^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28740497 and 28740506.

It is not an unprimeable number, because it can be changed into a prime (28740539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98281 + ... + 98572.

Almost surely, 2^28740538 is an apocalyptic number.

28740538 is a deficient number, since it is larger than the sum of its proper divisors (14961050).

28740538 is a wasteful number, since it uses less digits than its factorization.

28740538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196928.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28740538 is about 5361.0202387232. The cubic root of 28740538 is about 306.3126725546.

The spelling of 28740538 in words is "twenty-eight million, seven hundred forty thousand, five hundred thirty-eight".