55517520 has 40 divisors (see below), whose sum is σ = 172105056. Its totient is φ = 14804608.

The previous prime is 55517519. The next prime is 55517521. The reversal of 55517520 is 2571555.

It is an interprime number because it is at equal distance from previous prime (55517519) and next prime (55517521).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55517521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115422 + ... + 115901.

Almost surely, 2^55517520 is an apocalyptic number.

It is an amenable number.

55517520 is an abundant number, since it is smaller than the sum of its proper divisors (116587536).

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

55517520 is a wasteful number, since it uses less digits than its factorization.

55517520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231339 (or 231333 counting only the distinct ones).

The product of its (nonzero) digits is 8750, while the sum is 30.

The square root of 55517520 is about 7451.0079855010. The cubic root of 55517520 is about 381.4843146198.

The spelling of 55517520 in words is "fifty-five million, five hundred seventeen thousand, five hundred twenty".