28148691 has 8 divisors (see below), whose sum is σ = 37556224. Its totient is φ = 18753480.

The previous prime is 28148689. The next prime is 28148693. The reversal of 28148691 is 19684182.

It is an interprime number because it is at equal distance from previous prime (28148689) and next prime (28148693).

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

It is not a de Polignac number, because 28148691 - 2¹ = 28148689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28148693) 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, 6606 + ... + 9996.

It is an arithmetic number, because the mean of its divisors is an integer number (4694528).

Almost surely, 2^28148691 is an apocalyptic number.

28148691 is a deficient number, since it is larger than the sum of its proper divisors (9407533).

28148691 is a wasteful number, since it uses less digits than its factorization.

28148691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161.

The product of its digits is 27648, while the sum is 39.

The square root of 28148691 is about 5305.5339976293. The cubic root of 28148691 is about 304.1954645239.

The spelling of 28148691 in words is "twenty-eight million, one hundred forty-eight thousand, six hundred ninety-one".