53415440 has 40 divisors (see below), whose sum is σ = 133746648. Its totient is φ = 19722240.

The previous prime is 53415437. The next prime is 53415463. The reversal of 53415440 is 4451435.

It can be written as a sum of positive squares in 4 ways, for example, as 1517824 + 51897616 = 1232^2 + 7204^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24641 + ... + 26720.

Almost surely, 2^53415440 is an apocalyptic number.

It is an amenable number.

53415440 is an abundant number, since it is smaller than the sum of its proper divisors (80331208).

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

53415440 is a wasteful number, since it uses less digits than its factorization.

53415440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51387 (or 51381 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 53415440 is about 7308.5867306888. The cubic root of 53415440 is about 376.6074758410.

Adding to 53415440 its reverse (4451435), we get a palindrome (57866875).

The spelling of 53415440 in words is "fifty-three million, four hundred fifteen thousand, four hundred forty".