55400436 has 120 divisors (see below), whose sum is σ = 178344320. Its totient is φ = 14603328.

The previous prime is 55400417. The next prime is 55400459. The reversal of 55400436 is 63400455.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28545 + ... + 30423.

Almost surely, 2^55400436 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 55400436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89172160).

55400436 is an abundant number, since it is smaller than the sum of its proper divisors (122943884).

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

55400436 is a wasteful number, since it uses less digits than its factorization.

55400436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 55400436 is about 7443.1469151159. The cubic root of 55400436 is about 381.2159480113.

The spelling of 55400436 in words is "fifty-five million, four hundred thousand, four hundred thirty-six".