28621005 has 16 divisors (see below), whose sum is σ = 52335744. Its totient is φ = 13083840.

The previous prime is 28621003. The next prime is 28621009. The reversal of 28621005 is 50012682.

It is not a de Polignac number, because 28621005 - 2¹ = 28621003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28621003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136186 + ... + 136395.

It is an arithmetic number, because the mean of its divisors is an integer number (3270984).

Almost surely, 2^28621005 is an apocalyptic number.

It is an amenable number.

28621005 is a deficient number, since it is larger than the sum of its proper divisors (23714739).

28621005 is a wasteful number, since it uses less digits than its factorization.

28621005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272596.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 28621005 is about 5349.8602785493. The cubic root of 28621005 is about 305.8874270862.

Adding to 28621005 its reverse (50012682), we get a palindrome (78633687).

The spelling of 28621005 in words is "twenty-eight million, six hundred twenty-one thousand, five".