28193664 has 32 divisors (see below), whose sum is σ = 74890440. Its totient is φ = 9397760.

The previous prime is 28193657. The next prime is 28193707. The reversal of 28193664 is 46639182.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 36327 + ... + 37094.

Almost surely, 2^28193664 is an apocalyptic number.

28193664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28193664 is an abundant number, since it is smaller than the sum of its proper divisors (46696776).

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

28193664 is an equidigital number, since it uses as much as digits as its factorization.

28193664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73438 (or 73426 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 28193664 is about 5309.7706165144. The cubic root of 28193664 is about 304.3573820981.

The spelling of 28193664 in words is "twenty-eight million, one hundred ninety-three thousand, six hundred sixty-four".