55771488 has 72 divisors (see below), whose sum is σ = 159567408. Its totient is φ = 18477312.

The previous prime is 55771483. The next prime is 55771519. The reversal of 55771488 is 88417755.

It is a happy number.

55771488 is a `hidden beast` number, since 557 + 7 + 14 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×55771488² = 6220917747468288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55771483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56245 + ... + 57227.

It is an arithmetic number, because the mean of its divisors is an integer number (2216214).

Almost surely, 2^55771488 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 55771488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79783704).

55771488 is an abundant number, since it is smaller than the sum of its proper divisors (103795920).

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

55771488 is a wasteful number, since it uses less digits than its factorization.

55771488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1185 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 55771488 is about 7468.0310658165. The cubic root of 55771488 is about 382.0651369604.

The spelling of 55771488 in words is "fifty-five million, seven hundred seventy-one thousand, four hundred eighty-eight".