55071500 has 192 divisors, whose sum is σ = 150958080. Its totient is φ = 17280000.

The previous prime is 55071479. The next prime is 55071553. The reversal of 55071500 is 517055.

It is a super-2 number, since 2×55071500² = 6065740224500000, which contains 22 as substring.

It is a congruent number.

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, 1776485 + ... + 1776515.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^55071500 is an apocalyptic number.

55071500 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 55071500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75479040).

55071500 is an abundant number, since it is smaller than the sum of its proper divisors (95886580).

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

55071500 is a wasteful number, since it uses less digits than its factorization.

55071500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 875, while the sum is 23.

The square root of 55071500 is about 7421.0174504579. The cubic root of 55071500 is about 380.4599693233.

Adding to 55071500 its reverse (517055), we get a palindrome (55588555).

It can be divided in two parts, 5507 and 1500, that added together give a palindrome (7007).

The spelling of 55071500 in words is "fifty-five million, seventy-one thousand, five hundred".