71918940 has 48 divisors (see below), whose sum is σ = 201858048. Its totient is φ = 19132224.

The previous prime is 71918929. The next prime is 71918947. The reversal of 71918940 is 4981917.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71918947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28989 + ... + 31371.

It is an arithmetic number, because the mean of its divisors is an integer number (4205376).

Almost surely, 2^71918940 is an apocalyptic number.

It is an amenable number.

71918940 is an abundant number, since it is smaller than the sum of its proper divisors (129939108).

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

71918940 is a wasteful number, since it uses less digits than its factorization.

71918940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898 (or 2896 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 71918940 is about 8480.5035227868. The cubic root of 71918940 is about 415.8605841377.

The spelling of 71918940 in words is "seventy-one million, nine hundred eighteen thousand, nine hundred forty".