53015432440 has 128 divisors (see below), whose sum is σ = 127588608000. Its totient is φ = 19781798400.

The previous prime is 53015432387. The next prime is 53015432507. The reversal of 53015432440 is 4423451035.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42108531 + ... + 42109789.

It is an arithmetic number, because the mean of its divisors is an integer number (996786000).

Almost surely, 2^53015432440 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 53015432440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63794304000).

53015432440 is an abundant number, since it is smaller than the sum of its proper divisors (74573175560).

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

53015432440 is a wasteful number, since it uses less digits than its factorization.

53015432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 53015432440 its reverse (4423451035), we get a palindrome (57438883475).

The spelling of 53015432440 in words is "fifty-three billion, fifteen million, four hundred thirty-two thousand, four hundred forty".