15555552 has 48 divisors (see below), whose sum is σ = 42158592. Its totient is φ = 5016960.

The previous prime is 15555541. The next prime is 15555557. The reversal of 15555552 is 25555551.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15555557) 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, 363 + ... + 5589.

It is an arithmetic number, because the mean of its divisors is an integer number (878304).

Almost surely, 2^15555552 is an apocalyptic number.

15555552 is a gapful number since it is divisible by the number (12) 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 15555552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21079296).

15555552 is an abundant number, since it is smaller than the sum of its proper divisors (26603040).

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

15555552 is a wasteful number, since it uses less digits than its factorization.

15555552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271 (or 5263 counting only the distinct ones).

The product of its digits is 31250, while the sum is 33.

The square root of 15555552 is about 3944.0527379841. The cubic root of 15555552 is about 249.6290605546.

Subtracting 15555552 from its reverse (25555551), we obtain a palindrome (9999999).

The spelling of 15555552 in words is "fifteen million, five hundred fifty-five thousand, five hundred fifty-two".