52211440 has 80 divisors (see below), whose sum is σ = 128920320. Its totient is φ = 19630080.

The previous prime is 52211389. The next prime is 52211443. The reversal of 52211440 is 4411225.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52211443) 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, 91476 + ... + 92044.

It is an arithmetic number, because the mean of its divisors is an integer number (1611504).

Almost surely, 2^52211440 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 52211440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64460160).

52211440 is an abundant number, since it is smaller than the sum of its proper divisors (76708880).

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

52211440 is a wasteful number, since it uses less digits than its factorization.

52211440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 52211440 is about 7225.7484041447. The cubic root of 52211440 is about 373.7563303589.

Adding to 52211440 its reverse (4411225), we get a palindrome (56622665).

The spelling of 52211440 in words is "fifty-two million, two hundred eleven thousand, four hundred forty".