71653740 has 96 divisors (see below), whose sum is σ = 211438080. Its totient is φ = 18095616.

The previous prime is 71653739. The next prime is 71653787. The reversal of 71653740 is 4735617.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188871 + ... + 189249.

It is an arithmetic number, because the mean of its divisors is an integer number (2202480).

Almost surely, 2^71653740 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 71653740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105719040).

71653740 is an abundant number, since it is smaller than the sum of its proper divisors (139784340).

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

71653740 is a wasteful number, since it uses less digits than its factorization.

71653740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 71653740 is about 8464.8532178650. The cubic root of 71653740 is about 415.3487946846.

The spelling of 71653740 in words is "seventy-one million, six hundred fifty-three thousand, seven hundred forty".