27721960 has 64 divisors (see below), whose sum is σ = 71809920. Its totient is φ = 9434880.

The previous prime is 27721949. The next prime is 27721973. The reversal of 27721960 is 6912772.

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, 50407 + ... + 50953.

It is an arithmetic number, because the mean of its divisors is an integer number (1122030).

Almost surely, 2^27721960 is an apocalyptic number.

27721960 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 27721960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35904960).

27721960 is an abundant number, since it is smaller than the sum of its proper divisors (44087960).

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

27721960 is a wasteful number, since it uses less digits than its factorization.

27721960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 27721960 is about 5265.1647647533. The cubic root of 27721960 is about 302.6504408447.

It can be divided in two parts, 27721 and 960, that multiplied together give a triangular number (26612160 = T₇₂₉₅).

The spelling of 27721960 in words is "twenty-seven million, seven hundred twenty-one thousand, nine hundred sixty".