27801312 has 96 divisors (see below), whose sum is σ = 91010304. Its totient is φ = 7219200.

The previous prime is 27801311. The next prime is 27801317. The reversal of 27801312 is 21310872.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27801311) 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, 5512 + ... + 9272.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^27801312 is an apocalyptic number.

27801312 is a gapful number since it is divisible by the number (22) 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 27801312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45505152).

27801312 is an abundant number, since it is smaller than the sum of its proper divisors (63208992).

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

27801312 is a wasteful number, since it uses less digits than its factorization.

27801312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792 (or 3784 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 27801312 is about 5272.6949466094. The cubic root of 27801312 is about 302.9389370354.

The spelling of 27801312 in words is "twenty-seven million, eight hundred one thousand, three hundred twelve".