53440380 has 216 divisors, whose sum is σ = 193454352. Its totient is φ = 11902464.

The previous prime is 53440337. The next prime is 53440391. The reversal of 53440380 is 8304435.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 643819 + ... + 643901.

It is an arithmetic number, because the mean of its divisors is an integer number (895622).

Almost surely, 2^53440380 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 53440380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96727176).

53440380 is an abundant number, since it is smaller than the sum of its proper divisors (140013972).

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

53440380 is a wasteful number, since it uses less digits than its factorization.

53440380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 53440380 is about 7310.2927437962. The cubic root of 53440380 is about 376.6660801759. Note that the first 3 decimals are identical.

The spelling of 53440380 in words is "fifty-three million, four hundred forty thousand, three hundred eighty".