53442440 has 48 divisors (see below), whose sum is σ = 126941580. Its totient is φ = 20246400.

The previous prime is 53442437. The next prime is 53442443. The reversal of 53442440 is 4424435.

It is an interprime number because it is at equal distance from previous prime (53442437) and next prime (53442443).

It can be written as a sum of positive squares in 2 ways, for example, as 52678564 + 763876 = 7258^2 + 874^2 .

It is not an unprimeable number, because it can be changed into a prime (53442443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12590 + ... + 16290.

Almost surely, 2^53442440 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 53442440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63470790).

53442440 is an abundant number, since it is smaller than the sum of its proper divisors (73499140).

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

53442440 is a wasteful number, since it uses less digits than its factorization.

53442440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750 (or 3727 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 53442440 is about 7310.4336396687. The cubic root of 53442440 is about 376.6709199753.

Adding to 53442440 its reverse (4424435), we get a palindrome (57866875).

The spelling of 53442440 in words is "fifty-three million, four hundred forty-two thousand, four hundred forty".