55415550 has 48 divisors (see below), whose sum is σ = 137884032.
Its totient is φ = 14728800.
The previous prime is 55415537. The next prime is 55415557. The reversal of 55415550 is 5551455.
It is a Harshad number since it is a multiple of its sum of digits (30).
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (55415557) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85327 + ... + 85973.
It is an arithmetic number, because the mean of its divisors is an integer number (2872584).
Almost surely, 255415550 is an apocalyptic number.
55415550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.
55415550 is an abundant number, since it is smaller than the sum of its proper divisors (82468482).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55415550 is a wasteful number, since it uses less digits than its factorization.
55415550 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1233 (or 1228 counting only the distinct ones).
The product of its (nonzero) digits is 12500, while the sum is 30.
The square root of 55415550 is about 7444.1621422427.
The cubic root of 55415550 is about 381.2506118417.
The spelling of 55415550 in words is "fifty-five million, four hundred fifteen thousand, five hundred fifty".