55521400 has 48 divisors (see below), whose sum is σ = 140828040. Its totient is φ = 20188800.

The previous prime is 55521377. The next prime is 55521443. The reversal of 55521400 is 412555.

55521400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10419 + ... + 14818.

Almost surely, 2^55521400 is an apocalyptic number.

55521400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55521400 is an abundant number, since it is smaller than the sum of its proper divisors (85306640).

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

55521400 is a wasteful number, since it uses less digits than its factorization.

55521400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25264 (or 25255 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55521400 is about 7451.2683484089. The cubic root of 55521400 is about 381.4932014520.

Adding to 55521400 its reverse (412555), we get a palindrome (55933955).

The spelling of 55521400 in words is "fifty-five million, five hundred twenty-one thousand, four hundred".