55758444 has 72 divisors (see below), whose sum is σ = 152651520. Its totient is φ = 15517152.

The previous prime is 55758433. The next prime is 55758467. The reversal of 55758444 is 44485755.

It is a happy number.

It is a super-2 number, since 2×55758444² = 6218008154602272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 55758396 and 55758405.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155137 + ... + 155495.

It is an arithmetic number, because the mean of its divisors is an integer number (2120160).

Almost surely, 2^55758444 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 55758444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76325760).

55758444 is an abundant number, since it is smaller than the sum of its proper divisors (96893076).

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

55758444 is a wasteful number, since it uses less digits than its factorization.

55758444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 414 counting only the distinct ones).

The product of its digits is 448000, while the sum is 42.

The square root of 55758444 is about 7467.1576921878. The cubic root of 55758444 is about 382.0353484645.

The spelling of 55758444 in words is "fifty-five million, seven hundred fifty-eight thousand, four hundred forty-four".