28129371 has 8 divisors (see below), whose sum is σ = 38141760. Its totient is φ = 18434952.

The previous prime is 28129301. The next prime is 28129393. The reversal of 28129371 is 17392182.

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

It is not a de Polignac number, because 28129371 - 2⁷ = 28129243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28129301) 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, 79285 + ... + 79638.

It is an arithmetic number, because the mean of its divisors is an integer number (4767720).

Almost surely, 2^28129371 is an apocalyptic number.

28129371 is a deficient number, since it is larger than the sum of its proper divisors (10012389).

28129371 is a wasteful number, since it uses less digits than its factorization.

28129371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158985.

The product of its digits is 6048, while the sum is 33.

The square root of 28129371 is about 5303.7129447209. The cubic root of 28129371 is about 304.1258532174.

The spelling of 28129371 in words is "twenty-eight million, one hundred twenty-nine thousand, three hundred seventy-one".