55330660 has 192 divisors, whose sum is σ = 159989760. Its totient is φ = 15552000.

The previous prime is 55330633. The next prime is 55330661. The reversal of 55330660 is 6603355.

It is a super-2 number, since 2×55330660² = 6122963872071200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (55330661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 907030 + ... + 907090.

It is an arithmetic number, because the mean of its divisors is an integer number (833280).

Almost surely, 2^55330660 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 55330660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79994880).

55330660 is an abundant number, since it is smaller than the sum of its proper divisors (104659100).

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

55330660 is a wasteful number, since it uses less digits than its factorization.

55330660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 55330660 is about 7438.4581735733. The cubic root of 55330660 is about 381.0558355582.

It can be divided in two parts, 553 and 30660, that added together give a palindrome (31213).

The spelling of 55330660 in words is "fifty-five million, three hundred thirty thousand, six hundred sixty".