52215140 has 48 divisors (see below), whose sum is σ = 115429104. Its totient is φ = 19814400.

The previous prime is 52215133. The next prime is 52215157. The reversal of 52215140 is 4151225.

It can be written as a sum of positive squares in 8 ways, for example, as 64 + 52215076 = 8^2 + 7226^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 29480 + ... + 31200.

It is an arithmetic number, because the mean of its divisors is an integer number (2404773).

Almost surely, 2^52215140 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 52215140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57714552).

52215140 is an abundant number, since it is smaller than the sum of its proper divisors (63213964).

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

52215140 is a wasteful number, since it uses less digits than its factorization.

52215140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 52215140 is about 7226.0044284515. The cubic root of 52215140 is about 373.7651589844.

Adding to 52215140 its reverse (4151225), we get a palindrome (56366365).

The spelling of 52215140 in words is "fifty-two million, two hundred fifteen thousand, one hundred forty".