55138432 has 16 divisors (see below), whose sum is σ = 109846350. Its totient is φ = 27569152.

The previous prime is 55138423. The next prime is 55138439. The reversal of 55138432 is 23483155.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 141376 = 7416^2 + 376^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 55138394 and 55138403.

It is not an unprimeable number, because it can be changed into a prime (55138439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215257 + ... + 215512.

Almost surely, 2^55138432 is an apocalyptic number.

It is an amenable number.

55138432 is a deficient number, since it is larger than the sum of its proper divisors (54707918).

55138432 is an equidigital number, since it uses as much as digits as its factorization.

55138432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430783 (or 430771 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 55138432 is about 7425.5257052952. The cubic root of 55138432 is about 380.6140395606.

It can be divided in two parts, 551 and 38432, that added together give a palindrome (38983).

The spelling of 55138432 in words is "fifty-five million, one hundred thirty-eight thousand, four hundred thirty-two".