71550420 has 48 divisors (see below), whose sum is σ = 202341888. Its totient is φ = 18889600.

The previous prime is 71550419. The next prime is 71550431. The reversal of 71550420 is 2405517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (4215456).

Almost surely, 2^71550420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71550420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101170944).

71550420 is an abundant number, since it is smaller than the sum of its proper divisors (130791468).

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

71550420 is a wasteful number, since it uses less digits than its factorization.

71550420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11920 (or 11918 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 71550420 is about 8458.7481343282. The cubic root of 71550420 is about 415.1490634014.

Adding to 71550420 its reverse (2405517), we get a palindrome (73955937).

The spelling of 71550420 in words is "seventy-one million, five hundred fifty thousand, four hundred twenty".