27985720 has 64 divisors (see below), whose sum is σ = 72622080. Its totient is φ = 9507456.

The previous prime is 27985717. The next prime is 27985751. The reversal of 27985720 is 2758972.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35167 + ... + 35953.

It is an arithmetic number, because the mean of its divisors is an integer number (1134720).

Almost surely, 2^27985720 is an apocalyptic number.

27985720 is a gapful number since it is divisible by the number (20) 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 27985720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36311040).

27985720 is an abundant number, since it is smaller than the sum of its proper divisors (44636360).

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

27985720 is a wasteful number, since it uses less digits than its factorization.

27985720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 27985720 is about 5290.1531168767. The cubic root of 27985720 is about 303.6072663968.

The spelling of 27985720 in words is "twenty-seven million, nine hundred eighty-five thousand, seven hundred twenty".