52645440 has 224 divisors, whose sum is σ = 181416960. Its totient is φ = 12902400.

The previous prime is 52645429. The next prime is 52645441. The reversal of 52645440 is 4454625.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 52645398 and 52645407.

It is not an unprimeable number, because it can be changed into a prime (52645441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 863010 + ... + 863070.

Almost surely, 2^52645440 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 52645440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90708480).

52645440 is an abundant number, since it is smaller than the sum of its proper divisors (128771520).

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

52645440 is a wasteful number, since it uses less digits than its factorization.

52645440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 52645440 is about 7255.7177453371. The cubic root of 52645440 is about 374.7890724923.

The spelling of 52645440 in words is "fifty-two million, six hundred forty-five thousand, four hundred forty".