28226688 has 64 divisors (see below), whose sum is σ = 85696320. Its totient is φ = 8064000.

The previous prime is 28226663. The next prime is 28226699. The reversal of 28226688 is 88662282.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2563 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (1339005).

Almost surely, 2^28226688 is an apocalyptic number.

28226688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28226688 is an abundant number, since it is smaller than the sum of its proper divisors (57469632).

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

28226688 is a wasteful number, since it uses less digits than its factorization.

28226688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10525 (or 10513 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 28226688 is about 5312.8794452726. The cubic root of 28226688 is about 304.4761697373.

The spelling of 28226688 in words is "twenty-eight million, two hundred twenty-six thousand, six hundred eighty-eight".