28129465 has 32 divisors (see below), whose sum is σ = 41884416. Its totient is φ = 17660160.

The previous prime is 28129459. The next prime is 28129469. The reversal of 28129465 is 56492182.

It is not a de Polignac number, because 28129465 - 2³ = 28129457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28129469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95859 + ... + 96151.

It is an arithmetic number, because the mean of its divisors is an integer number (1308888).

Almost surely, 2^28129465 is an apocalyptic number.

It is an amenable number.

28129465 is a deficient number, since it is larger than the sum of its proper divisors (13754951).

28129465 is a wasteful number, since it uses less digits than its factorization.

28129465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529.

The product of its digits is 34560, while the sum is 37.

The square root of 28129465 is about 5303.7218064299. The cubic root of 28129465 is about 304.1261919831.

The spelling of 28129465 in words is "twenty-eight million, one hundred twenty-nine thousand, four hundred sixty-five".