52279440 has 80 divisors (see below), whose sum is σ = 164769216. Its totient is φ = 13708800.

The previous prime is 52279433. The next prime is 52279441. The reversal of 52279440 is 4497225.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (52279441) 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, 12855 + ... + 16425.

Almost surely, 2^52279440 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 52279440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82384608).

52279440 is an abundant number, since it is smaller than the sum of its proper divisors (112489776).

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

52279440 is a wasteful number, since it uses less digits than its factorization.

52279440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648 (or 3642 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 52279440 is about 7230.4522680120. The cubic root of 52279440 is about 373.9185196210.

The spelling of 52279440 in words is "fifty-two million, two hundred seventy-nine thousand, four hundred forty".