71222688 has 36 divisors (see below), whose sum is σ = 202540338. Its totient is φ = 23740800.

The previous prime is 71222681. The next prime is 71222737. The reversal of 71222688 is 88622217.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68359824 + 2862864 = 8268^2 + 1692^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (71222681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123363 + ... + 123938.

Almost surely, 2^71222688 is an apocalyptic number.

It is an amenable number.

71222688 is an abundant number, since it is smaller than the sum of its proper divisors (131317650).

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

71222688 is a wasteful number, since it uses less digits than its factorization.

71222688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247317 (or 247306 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 71222688 is about 8439.3535297439. The cubic root of 71222688 is about 414.5142388146.

The spelling of 71222688 in words is "seventy-one million, two hundred twenty-two thousand, six hundred eighty-eight".