71438840 has 64 divisors (see below), whose sum is σ = 176364000. Its totient is φ = 25827840.

The previous prime is 71438837. The next prime is 71438863. The reversal of 71438840 is 4883417.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71438840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100406 + ... + 101114.

Almost surely, 2^71438840 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 71438840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88182000).

71438840 is an abundant number, since it is smaller than the sum of its proper divisors (104925160).

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

71438840 is a wasteful number, since it uses less digits than its factorization.

71438840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 71438840 is about 8452.1500223316. The cubic root of 71438840 is about 414.9331483742.

The spelling of 71438840 in words is "seventy-one million, four hundred thirty-eight thousand, eight hundred forty".