55389180 has 192 divisors, whose sum is σ = 203857920. Its totient is φ = 10886400.

The previous prime is 55389167. The next prime is 55389211. The reversal of 55389180 is 8198355.

It is a super-2 number, since 2×55389180² = 6135922522144800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87465 + ... + 88095.

It is an arithmetic number, because the mean of its divisors is an integer number (1061760).

Almost surely, 2^55389180 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 55389180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101928960).

55389180 is an abundant number, since it is smaller than the sum of its proper divisors (148468740).

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

55389180 is a wasteful number, since it uses less digits than its factorization.

55389180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 55389180 is about 7442.3907449152. The cubic root of 55389180 is about 381.1901283748.

The spelling of 55389180 in words is "fifty-five million, three hundred eighty-nine thousand, one hundred eighty".