52090640 has 80 divisors (see below), whose sum is σ = 139491072. Its totient is φ = 17720832.

The previous prime is 52090639. The next prime is 52090651. The reversal of 52090640 is 4609025.

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

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, 93242 + ... + 93798.

Almost surely, 2^52090640 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 52090640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69745536).

52090640 is an abundant number, since it is smaller than the sum of its proper divisors (87400432).

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

52090640 is a wasteful number, since it uses less digits than its factorization.

52090640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 52090640 is about 7217.3845678334. The cubic root of 52090640 is about 373.4678582662.

Adding to 52090640 its reverse (4609025), we get a palindrome (56699665).

The spelling of 52090640 in words is "fifty-two million, ninety thousand, six hundred forty".