28611408 has 80 divisors (see below), whose sum is σ = 89458560. Its totient is φ = 7692288.

The previous prime is 28611403. The next prime is 28611409. The reversal of 28611408 is 80411682.

It is a super-2 number, since 2×28611408² = 1637225335484928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28611403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3208 + ... + 8216.

It is an arithmetic number, because the mean of its divisors is an integer number (1118232).

Almost surely, 2^28611408 is an apocalyptic number.

28611408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28611408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44729280).

28611408 is an abundant number, since it is smaller than the sum of its proper divisors (60847152).

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

28611408 is a wasteful number, since it uses less digits than its factorization.

28611408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044 (or 5038 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 28611408 is about 5348.9632640354. The cubic root of 28611408 is about 305.8532339028.

The spelling of 28611408 in words is "twenty-eight million, six hundred eleven thousand, four hundred eight".