71236420 has 24 divisors (see below), whose sum is σ = 149880024. Its totient is φ = 28440576.

The previous prime is 71236397. The next prime is 71236421. The reversal of 71236420 is 2463217.

It can be written as a sum of positive squares in 4 ways, for example, as 7268416 + 63968004 = 2696^2 + 7998^2 .

It is not an unprimeable number, because it can be changed into a prime (71236421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8454 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (6245001).

Almost surely, 2^71236420 is an apocalyptic number.

It is an amenable number.

71236420 is an abundant number, since it is smaller than the sum of its proper divisors (78643604).

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

71236420 is a wasteful number, since it uses less digits than its factorization.

71236420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759 (or 6757 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 71236420 is about 8440.1670599580. The cubic root of 71236420 is about 414.5408770667.

Adding to 71236420 its reverse (2463217), we get a palindrome (73699637).

The spelling of 71236420 in words is "seventy-one million, two hundred thirty-six thousand, four hundred twenty".