55151232 has 128 divisors (see below), whose sum is σ = 156280320. Its totient is φ = 17203200.

The previous prime is 55151221. The next prime is 55151237. The reversal of 55151232 is 23215155.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×55151232² = 6083316782235648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (55151237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488008 + ... + 488120.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^55151232 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 55151232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78140160).

55151232 is an abundant number, since it is smaller than the sum of its proper divisors (101129088).

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

55151232 is a wasteful number, since it uses less digits than its factorization.

55151232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 190 counting only the distinct ones).

The product of its digits is 1500, while the sum is 24.

The square root of 55151232 is about 7426.3875471187. The cubic root of 55151232 is about 380.6434895745.

Adding to 55151232 its reverse (23215155), we get a palindrome (78366387).

The spelling of 55151232 in words is "fifty-five million, one hundred fifty-one thousand, two hundred thirty-two".