27958812 has 72 divisors (see below), whose sum is σ = 80380944. Its totient is φ = 7515648.

The previous prime is 27958789. The next prime is 27958841. The reversal of 27958812 is 21885972.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8598 + ... + 11394.

It is an arithmetic number, because the mean of its divisors is an integer number (1116402).

Almost surely, 2^27958812 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 27958812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40190472).

27958812 is an abundant number, since it is smaller than the sum of its proper divisors (52422132).

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

27958812 is a wasteful number, since it uses less digits than its factorization.

27958812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835 (or 2826 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 27958812 is about 5287.6092896507. The cubic root of 27958812 is about 303.5099300409.

The spelling of 27958812 in words is "twenty-seven million, nine hundred fifty-eight thousand, eight hundred twelve".