55085520 has 80 divisors (see below), whose sum is σ = 195166080. Its totient is φ = 12590592.

The previous prime is 55085519. The next prime is 55085521. The reversal of 55085520 is 2558055.

It is an interprime number because it is at equal distance from previous prime (55085519) and next prime (55085521).

It is a tau number, because it is divible by the number of its divisors (80).

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 (55085521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14715 + ... + 18074.

It is an arithmetic number, because the mean of its divisors is an integer number (2439576).

Almost surely, 2^55085520 is an apocalyptic number.

It is an amenable number.

55085520 is an abundant number, since it is smaller than the sum of its proper divisors (140080560).

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

55085520 is a wasteful number, since it uses less digits than its factorization.

55085520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32812 (or 32806 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 55085520 is about 7421.9620047532. The cubic root of 55085520 is about 380.4922521810.

The spelling of 55085520 in words is "fifty-five million, eighty-five thousand, five hundred twenty".