71550030 has 32 divisors (see below), whose sum is σ = 171943200. Its totient is φ = 19055232.

The previous prime is 71549999. The next prime is 71550049. The reversal of 71550030 is 3005517.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71549979 and 71550006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42036 + ... + 43704.

It is an arithmetic number, because the mean of its divisors is an integer number (5373225).

Almost surely, 2^71550030 is an apocalyptic number.

71550030 is an abundant number, since it is smaller than the sum of its proper divisors (100393170).

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

71550030 is a wasteful number, since it uses less digits than its factorization.

71550030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108.

The product of its (nonzero) digits is 525, while the sum is 21.

The square root of 71550030 is about 8458.7250812401. The cubic root of 71550030 is about 415.1483091154.

Adding to 71550030 its reverse (3005517), we get a palindrome (74555547).

The spelling of 71550030 in words is "seventy-one million, five hundred fifty thousand, thirty".