52220740 has 144 divisors (see below), whose sum is σ = 140132160. Its totient is φ = 16070400.

The previous prime is 52220731. The next prime is 52220743. The reversal of 52220740 is 4702225.

It is a super-2 number, since 2×52220740² = 5454011372295200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52220743) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1684525 + ... + 1684555.

It is an arithmetic number, because the mean of its divisors is an integer number (973140).

Almost surely, 2^52220740 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 52220740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70066080).

52220740 is an abundant number, since it is smaller than the sum of its proper divisors (87911420).

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

52220740 is a wasteful number, since it uses less digits than its factorization.

52220740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 52220740 is about 7226.3919074459. The cubic root of 52220740 is about 373.7785204352.

Adding to 52220740 its reverse (4702225), we get a palindrome (56922965).

The spelling of 52220740 in words is "fifty-two million, two hundred twenty thousand, seven hundred forty".