71421558 has 32 divisors (see below), whose sum is σ = 154780416. Its totient is φ = 21840288.

The previous prime is 71421541. The next prime is 71421599. The reversal of 71421558 is 85512417.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10285 + ... + 15767.

It is an arithmetic number, because the mean of its divisors is an integer number (4836888).

Almost surely, 2^71421558 is an apocalyptic number.

71421558 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 71421558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77390208).

71421558 is an abundant number, since it is smaller than the sum of its proper divisors (83358858).

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

71421558 is a wasteful number, since it uses less digits than its factorization.

71421558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668.

The product of its digits is 11200, while the sum is 33.

The square root of 71421558 is about 8451.1276170698. The cubic root of 71421558 is about 414.8996864040.

The spelling of 71421558 in words is "seventy-one million, four hundred twenty-one thousand, five hundred fifty-eight".