71673720 has 64 divisors (see below), whose sum is σ = 216760320. Its totient is φ = 18958464.

The previous prime is 71673691. The next prime is 71673743. The reversal of 71673720 is 2737617.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12889 + ... + 17591.

It is an arithmetic number, because the mean of its divisors is an integer number (3386880).

Almost surely, 2^71673720 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 71673720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108380160).

71673720 is an abundant number, since it is smaller than the sum of its proper divisors (145086600).

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

71673720 is a wasteful number, since it uses less digits than its factorization.

71673720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4844 (or 4840 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 71673720 is about 8466.0333096439. The cubic root of 71673720 is about 415.3873965204.

The spelling of 71673720 in words is "seventy-one million, six hundred seventy-three thousand, seven hundred twenty".