28860405 has 16 divisors (see below), whose sum is σ = 52773504. Its totient is φ = 13193280.

The previous prime is 28860401. The next prime is 28860413. The reversal of 28860405 is 50406882.

It is not a de Polignac number, because 28860405 - 2² = 28860401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28860401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137326 + ... + 137535.

It is an arithmetic number, because the mean of its divisors is an integer number (3298344).

Almost surely, 2^28860405 is an apocalyptic number.

It is an amenable number.

28860405 is a deficient number, since it is larger than the sum of its proper divisors (23913099).

28860405 is a wasteful number, since it uses less digits than its factorization.

28860405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274876.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28860405 is about 5372.1881016956. The cubic root of 28860405 is about 306.7379238688.

The spelling of 28860405 in words is "twenty-eight million, eight hundred sixty thousand, four hundred five".