55380400 has 30 divisors (see below), whose sum is σ = 133052372. Its totient is φ = 22152000.

The previous prime is 55380397. The next prime is 55380419. The reversal of 55380400 is 408355.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68826 + ... + 69625.

Almost surely, 2^55380400 is an apocalyptic number.

55380400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55380400 is an abundant number, since it is smaller than the sum of its proper divisors (77671972).

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

55380400 is a wasteful number, since it uses less digits than its factorization.

55380400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138469 (or 138458 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 55380400 is about 7441.8008573194. The cubic root of 55380400 is about 381.1699858958.

Adding to 55380400 its reverse (408355), we get a palindrome (55788755).

The spelling of 55380400 in words is "fifty-five million, three hundred eighty thousand, four hundred".