55051500 has 192 divisors, whose sum is σ = 188697600. Its totient is φ = 12465600.

The previous prime is 55051487. The next prime is 55051519. The reversal of 55051500 is 515055.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 514447 + ... + 514553.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^55051500 is an apocalyptic number.

55051500 is a gapful number since it is divisible by the number (50) 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 55051500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

55051500 is an abundant number, since it is smaller than the sum of its proper divisors (133646100).

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

55051500 is a wasteful number, since it uses less digits than its factorization.

55051500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 124 counting only the distinct ones).

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

The square root of 55051500 is about 7419.6698039738. The cubic root of 55051500 is about 380.4139072603.

Adding to 55051500 its reverse (515055), we get a palindrome (55566555).

It can be divided in two parts, 5 and 5051500, that added together give a palindrome (5051505).

The spelling of 55051500 in words is "fifty-five million, fifty-one thousand, five hundred".