28711408 has 40 divisors (see below), whose sum is σ = 62339760. Its totient is φ = 12695040.

The previous prime is 28711399. The next prime is 28711409. The reversal of 28711408 is 80411782.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28711408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28711409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4308 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (1558494).

Almost surely, 2^28711408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28711408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31169880).

28711408 is an abundant number, since it is smaller than the sum of its proper divisors (33628352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28711408 is a wasteful number, since it uses less digits than its factorization.

28711408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465 (or 4459 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 28711408 is about 5358.3027163459. The cubic root of 28711408 is about 306.2091497366.

The spelling of 28711408 in words is "twenty-eight million, seven hundred eleven thousand, four hundred eight".