1555552000 has 72 divisors (see below), whose sum is σ = 3875154192. Its totient is φ = 622208000.

The previous prime is 1555551989. The next prime is 1555552001. The reversal of 1555552000 is 2555551.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555552000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555552001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7695 + ... + 56305.

It is an arithmetic number, because the mean of its divisors is an integer number (53821586).

Almost surely, 2^1555552000 is an apocalyptic number.

1555552000 is a gapful number since it is divisible by the number (10) 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 1555552000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1937577096).

1555552000 is an abundant number, since it is smaller than the sum of its proper divisors (2319602192).

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

1555552000 is an frugal number, since it uses more digits than its factorization.

1555552000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48642 (or 48618 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 1555552000 is about 39440.4868124114. The cubic root of 1555552000 is about 1158.6746654944.

The spelling of 1555552000 in words is "one billion, five hundred fifty-five million, five hundred fifty-two thousand".