71240688 has 80 divisors (see below), whose sum is σ = 210060960. Its totient is φ = 23099904.

The previous prime is 71240669. The next prime is 71240711. The reversal of 71240688 is 88604217.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 13756 + ... + 18212.

It is an arithmetic number, because the mean of its divisors is an integer number (2625762).

Almost surely, 2^71240688 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 71240688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105030480).

71240688 is an abundant number, since it is smaller than the sum of its proper divisors (138820272).

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

71240688 is a wasteful number, since it uses less digits than its factorization.

71240688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4499 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 71240688 is about 8440.4198947683. The cubic root of 71240688 is about 414.5491557212.

The spelling of 71240688 in words is "seventy-one million, two hundred forty thousand, six hundred eighty-eight".