28971142 has 4 divisors (see below), whose sum is σ = 43456716. Its totient is φ = 14485570.

The previous prime is 28971127. The next prime is 28971149. The reversal of 28971142 is 24117982.

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

It is a junction number, because it is equal to n+sod(n) for n = 28971098 and 28971107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7242784 + ... + 7242787.

It is an arithmetic number, because the mean of its divisors is an integer number (10864179).

Almost surely, 2^28971142 is an apocalyptic number.

28971142 is a deficient number, since it is larger than the sum of its proper divisors (14485574).

28971142 is a wasteful number, since it uses less digits than its factorization.

28971142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14485573.

The product of its digits is 8064, while the sum is 34.

The square root of 28971142 is about 5382.4847421985. The cubic root of 28971142 is about 307.1297396443.

The spelling of 28971142 in words is "twenty-eight million, nine hundred seventy-one thousand, one hundred forty-two".