71549840 has 40 divisors (see below), whose sum is σ = 167483328. Its totient is φ = 28425600.

The previous prime is 71549827. The next prime is 71549851. The reversal of 71549840 is 4894517.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 71549794 and 71549803.

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, 9119 + ... + 15041.

Almost surely, 2^71549840 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 71549840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83741664).

71549840 is an abundant number, since it is smaller than the sum of its proper divisors (95933488).

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

71549840 is a wasteful number, since it uses less digits than its factorization.

71549840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087 (or 6081 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 71549840 is about 8458.7138502257. The cubic root of 71549840 is about 415.1479416418.

The spelling of 71549840 in words is "seventy-one million, five hundred forty-nine thousand, eight hundred forty".