28106538 has 16 divisors (see below), whose sum is σ = 57166560. Its totient is φ = 9209936.

The previous prime is 28106527. The next prime is 28106549. The reversal of 28106538 is 83560182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28106527) and next prime (28106549).

It is a junction number, because it is equal to n+sod(n) for n = 28106499 and 28106508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39345 + ... + 40052.

It is an arithmetic number, because the mean of its divisors is an integer number (3572910).

Almost surely, 2^28106538 is an apocalyptic number.

28106538 is an abundant number, since it is smaller than the sum of its proper divisors (29060022).

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

28106538 is a wasteful number, since it uses less digits than its factorization.

28106538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79461.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28106538 is about 5301.5599591064. The cubic root of 28106538 is about 304.0435432203.

The spelling of 28106538 in words is "twenty-eight million, one hundred six thousand, five hundred thirty-eight".