55238436 has 90 divisors (see below), whose sum is σ = 158837910. Its totient is φ = 16727040.

The previous prime is 55238431. The next prime is 55238467. The reversal of 55238436 is 63483255.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 24502500 = 5544^2 + 4950^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55238436.

It is not an unprimeable number, because it can be changed into a prime (55238431) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 38500 + ... + 39908.

Almost surely, 2^55238436 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 55238436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79418955).

55238436 is an abundant number, since it is smaller than the sum of its proper divisors (103599474).

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

55238436 is a wasteful number, since it uses less digits than its factorization.

55238436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447 (or 1425 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 55238436 is about 7432.2564541329. The cubic root of 55238436 is about 380.8440058276.

The spelling of 55238436 in words is "fifty-five million, two hundred thirty-eight thousand, four hundred thirty-six".