55776660 has 96 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 13867008.

The previous prime is 55776641. The next prime is 55776661. The reversal of 55776660 is 6667755.

It is a super-2 number, since 2×55776660² = 6222071601511200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55776661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151797 + ... + 152163.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^55776660 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 55776660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83462400).

55776660 is an abundant number, since it is smaller than the sum of its proper divisors (111148140).

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

55776660 is a wasteful number, since it uses less digits than its factorization.

55776660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 42.

The square root of 55776660 is about 7468.3773337988. The cubic root of 55776660 is about 382.0769469365.

The spelling of 55776660 in words is "fifty-five million, seven hundred seventy-six thousand, six hundred sixty".