27421440 has 144 divisors (see below), whose sum is σ = 90410208. Its totient is φ = 7077888.

The previous prime is 27421439. The next prime is 27421447. The reversal of 27421440 is 4412472.

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

It is a self number, because there is not a number n which added to its sum of digits gives 27421440.

It is not an unprimeable number, because it can be changed into a prime (27421447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141984 + ... + 142176.

Almost surely, 2^27421440 is an apocalyptic number.

27421440 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 27421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45205104).

27421440 is an abundant number, since it is smaller than the sum of its proper divisors (62988768).

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

27421440 is a wasteful number, since it uses less digits than its factorization.

27421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 27421440 is about 5236.5484815859. The cubic root of 27421440 is about 301.5528373415.

The spelling of 27421440 in words is "twenty-seven million, four hundred twenty-one thousand, four hundred forty".