71989740 has 144 divisors (see below), whose sum is σ = 228324096. Its totient is φ = 18345600.

The previous prime is 71989739. The next prime is 71989751. The reversal of 71989740 is 4798917.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 549475 + ... + 549605.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^71989740 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 71989740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114162048).

71989740 is an abundant number, since it is smaller than the sum of its proper divisors (156334356).

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

71989740 is a wasteful number, since it uses less digits than its factorization.

71989740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 71989740 is about 8484.6767764011. The cubic root of 71989740 is about 415.9970028753.

The spelling of 71989740 in words is "seventy-one million, nine hundred eighty-nine thousand, seven hundred forty".