71449290 has 132 divisors (see below), whose sum is σ = 212043762. Its totient is φ = 17321040.

The previous prime is 71449277. The next prime is 71449297. The reversal of 71449290 is 9294417.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 7144929 = 8019^2 + 2673^2 .

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (71449297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 65 ways as a sum of consecutive naturals, for example, 6495385 + ... + 6495395.

Almost surely, 2^71449290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71449290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106021881).

71449290 is an abundant number, since it is smaller than the sum of its proper divisors (140594472).

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

71449290 is an equidigital number, since it uses as much as digits as its factorization.

71449290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 71449290 is about 8452.7681856301. The cubic root of 71449290 is about 414.9533793857.

The spelling of 71449290 in words is "seventy-one million, four hundred forty-nine thousand, two hundred ninety".