28149107 has 4 divisors (see below), whose sum is σ = 32170416. Its totient is φ = 24127800.

The previous prime is 28149103. The next prime is 28149113. The reversal of 28149107 is 70194182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28149107 - 2² = 28149103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28149101) 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, 2010644 + ... + 2010657.

It is an arithmetic number, because the mean of its divisors is an integer number (8042604).

Almost surely, 2^28149107 is an apocalyptic number.

28149107 is a deficient number, since it is larger than the sum of its proper divisors (4021309).

28149107 is an equidigital number, since it uses as much as digits as its factorization.

28149107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4021308.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 28149107 is about 5305.5732018322. The cubic root of 28149107 is about 304.1969630505.

The spelling of 28149107 in words is "twenty-eight million, one hundred forty-nine thousand, one hundred seven".