550521400 has 96 divisors (see below), whose sum is σ = 1503810000. Its totient is φ = 184780800.

The previous prime is 550521373. The next prime is 550521427. The reversal of 550521400 is 4125055.

It is an interprime number because it is at equal distance from previous prime (550521373) and next prime (550521427).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18976 + ... + 38224.

Almost surely, 2^550521400 is an apocalyptic number.

550521400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 550521400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751905000).

550521400 is an abundant number, since it is smaller than the sum of its proper divisors (953288600).

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

550521400 is a wasteful number, since it uses less digits than its factorization.

550521400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19289 (or 19280 counting only the distinct ones).

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

The square root of 550521400 is about 23463.1924511563. The cubic root of 550521400 is about 819.5800943511.

Adding to 550521400 its reverse (4125055), we get a palindrome (554646455).

The spelling of 550521400 in words is "five hundred fifty million, five hundred twenty-one thousand, four hundred".