55155552 has 48 divisors (see below), whose sum is σ = 145478592. Its totient is φ = 18296960.

The previous prime is 55155547. The next prime is 55155553. The reversal of 55155552 is 25555155.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55155553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20527 + ... + 23057.

It is an arithmetic number, because the mean of its divisors is an integer number (3030804).

Almost surely, 2^55155552 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 55155552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72739296).

55155552 is an abundant number, since it is smaller than the sum of its proper divisors (90323040).

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

55155552 is a wasteful number, since it uses less digits than its factorization.

55155552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771 (or 2763 counting only the distinct ones).

The product of its digits is 31250, while the sum is 33.

The square root of 55155552 is about 7426.6783961607. The cubic root of 55155552 is about 380.6534279257.

The spelling of 55155552 in words is "fifty-five million, one hundred fifty-five thousand, five hundred fifty-two".