71288380 has 48 divisors (see below), whose sum is σ = 163044000. Its totient is φ = 26078976.

The previous prime is 71288359. The next prime is 71288383. The reversal of 71288380 is 8388217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71288383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7786 + ... + 14254.

It is an arithmetic number, because the mean of its divisors is an integer number (3396750).

Almost surely, 2^71288380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71288380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81522000).

71288380 is an abundant number, since it is smaller than the sum of its proper divisors (91755620).

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

71288380 is a wasteful number, since it uses less digits than its factorization.

71288380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6526 (or 6524 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 71288380 is about 8443.2446369864. The cubic root of 71288380 is about 414.6416415777.

The spelling of 71288380 in words is "seventy-one million, two hundred eighty-eight thousand, three hundred eighty".