28015139 has 8 divisors (see below), whose sum is σ = 29580240. Its totient is φ = 26459136.

The previous prime is 28015123. The next prime is 28015151. The reversal of 28015139 is 93151082.

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

It is a cyclic number.

It is not a de Polignac number, because 28015139 - 2⁴ = 28015123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28015159) 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, 4619 + ... + 8795.

It is an arithmetic number, because the mean of its divisors is an integer number (3697530).

Almost surely, 2^28015139 is an apocalyptic number.

28015139 is a deficient number, since it is larger than the sum of its proper divisors (1565101).

28015139 is a wasteful number, since it uses less digits than its factorization.

28015139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 28015139 is about 5292.9329298603. The cubic root of 28015139 is about 303.7136146135.

The spelling of 28015139 in words is "twenty-eight million, fifteen thousand, one hundred thirty-nine".