71449440 has 48 divisors (see below), whose sum is σ = 225067248. Its totient is φ = 19053056.

The previous prime is 71449397. The next prime is 71449463. The reversal of 71449440 is 4494417.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73947 + ... + 74906.

It is an arithmetic number, because the mean of its divisors is an integer number (4688901).

Almost surely, 2^71449440 is an apocalyptic number.

It is an amenable number.

71449440 is an abundant number, since it is smaller than the sum of its proper divisors (153617808).

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

71449440 is a wasteful number, since it uses less digits than its factorization.

71449440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148871 (or 148863 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 71449440 is about 8452.7770584584. Note that the first 3 decimals coincide. The cubic root of 71449440 is about 414.9536697687.

The spelling of 71449440 in words is "seventy-one million, four hundred forty-nine thousand, four hundred forty".