55431040 has 64 divisors (see below), whose sum is σ = 151457760. Its totient is φ = 19003392.

The previous prime is 55431011. The next prime is 55431041. The reversal of 55431040 is 4013455.

55431040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707 + ... + 10666.

Almost surely, 2^55431040 is an apocalyptic number.

It is an amenable number.

55431040 is an abundant number, since it is smaller than the sum of its proper divisors (96026720).

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

55431040 is a wasteful number, since it uses less digits than its factorization.

55431040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12399 (or 12387 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55431040 is about 7445.2024821357. The cubic root of 55431040 is about 381.2861314856.

Adding to 55431040 its reverse (4013455), we get a palindrome (59444495).

The spelling of 55431040 in words is "fifty-five million, four hundred thirty-one thousand, forty".