71684940 has 96 divisors (see below), whose sum is σ = 206458560. Its totient is φ = 18579456.

The previous prime is 71684923. The next prime is 71684957. The reversal of 71684940 is 4948617.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71684923) and next prime (71684957).

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, 634324 + ... + 634436.

It is an arithmetic number, because the mean of its divisors is an integer number (2150610).

Almost surely, 2^71684940 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 71684940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103229280).

71684940 is an abundant number, since it is smaller than the sum of its proper divisors (134773620).

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

71684940 is a wasteful number, since it uses less digits than its factorization.

71684940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 71684940 is about 8466.6959317080. The cubic root of 71684940 is about 415.4090706822.

The spelling of 71684940 in words is "seventy-one million, six hundred eighty-four thousand, nine hundred forty".