52181520 has 80 divisors (see below), whose sum is σ = 165739392. Its totient is φ = 13573120.

The previous prime is 52181509. The next prime is 52181531. The reversal of 52181520 is 2518125.

It is an interprime number because it is at equal distance from previous prime (52181509) and next prime (52181531).

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

It is a super-2 number, since 2×52181520² = 5445822059020800, which contains 22 as substring.

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

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, 7189 + ... + 12491.

Almost surely, 2^52181520 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 52181520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82869696).

52181520 is an abundant number, since it is smaller than the sum of its proper divisors (113557872).

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

52181520 is a wasteful number, since it uses less digits than its factorization.

52181520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360 (or 5354 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 52181520 is about 7223.6777336756. The cubic root of 52181520 is about 373.6849224695.

Adding to 52181520 its reverse (2518125), we get a palindrome (54699645).

The spelling of 52181520 in words is "fifty-two million, one hundred eighty-one thousand, five hundred twenty".