15505500 has 48 divisors (see below), whose sum is σ = 45156384. Its totient is φ = 4134400.

The previous prime is 15505493. The next prime is 15505537. The reversal of 15505500 is 550551.

15505500 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3669 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (940758).

Almost surely, 2^15505500 is an apocalyptic number.

15505500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15505500 is an abundant number, since it is smaller than the sum of its proper divisors (29650884).

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

15505500 is a wasteful number, since it uses less digits than its factorization.

15505500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10359 (or 10347 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 15505500 is about 3937.7023757516. The cubic root of 15505500 is about 249.3610349527.

It can be divided in two parts, 15 and 505500, that added together give a triangular number (505515 = T₁₀₀₅).

The spelling of 15505500 in words is "fifteen million, five hundred five thousand, five hundred".