71288244 has 18 divisors (see below), whose sum is σ = 180200930. Its totient is φ = 23762736.

The previous prime is 71288153. The next prime is 71288263. The reversal of 71288244 is 44288217.

It can be written as a sum of positive squares in only one way, i.e., 68260644 + 3027600 = 8262^2 + 1740^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1980229 = 71288244 / (7 + 1 + 2 + 8 + 8 + 2 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 71288199 and 71288208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 990079 + ... + 990150.

Almost surely, 2^71288244 is an apocalyptic number.

It is an amenable number.

71288244 is an abundant number, since it is smaller than the sum of its proper divisors (108912686).

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

71288244 is a wasteful number, since it uses less digits than its factorization.

71288244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980239 (or 1980234 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 71288244 is about 8443.2365832067. The cubic root of 71288244 is about 414.6413779008.

The spelling of 71288244 in words is "seventy-one million, two hundred eighty-eight thousand, two hundred forty-four".