28140534 has 20 divisors (see below), whose sum is σ = 63056004. Its totient is φ = 9380124.

The previous prime is 28140521. The next prime is 28140557. The reversal of 28140534 is 43504182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28140498 and 28140507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 86692 + ... + 87015.

Almost surely, 2^28140534 is an apocalyptic number.

28140534 is an abundant number, since it is smaller than the sum of its proper divisors (34915470).

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

28140534 is a wasteful number, since it uses less digits than its factorization.

28140534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173721 (or 173712 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28140534 is about 5304.7652162937. The cubic root of 28140534 is about 304.1660781707.

The spelling of 28140534 in words is "twenty-eight million, one hundred forty thousand, five hundred thirty-four".