71228736 has 42 divisors (see below), whose sum is σ = 204165962. Its totient is φ = 23742720.

The previous prime is 71228719. The next prime is 71228783. The reversal of 71228736 is 63782217.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 24443136 = 6840^2 + 4944^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 71228736.

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 5 ways as a sum of consecutive naturals, for example, 61255 + ... + 62406.

Almost surely, 2^71228736 is an apocalyptic number.

It is an amenable number.

71228736 is an abundant number, since it is smaller than the sum of its proper divisors (132937226).

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

71228736 is a wasteful number, since it uses less digits than its factorization.

71228736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123679 (or 123666 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 71228736 is about 8439.7118434221. The cubic root of 71228736 is about 414.5259715514.

The spelling of 71228736 in words is "seventy-one million, two hundred twenty-eight thousand, seven hundred thirty-six".