71613940 has 12 divisors (see below), whose sum is σ = 150389316. Its totient is φ = 28645568.

The previous prime is 71613929. The next prime is 71613953. The reversal of 71613940 is 4931617.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23561316 + 48052624 = 4854^2 + 6932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1790329 + ... + 1790368.

It is an arithmetic number, because the mean of its divisors is an integer number (12532443).

Almost surely, 2^71613940 is an apocalyptic number.

It is an amenable number.

71613940 is an abundant number, since it is smaller than the sum of its proper divisors (78775376).

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

71613940 is a wasteful number, since it uses less digits than its factorization.

71613940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580706 (or 3580704 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 71613940 is about 8462.5019940913. The cubic root of 71613940 is about 415.2718787476.

The spelling of 71613940 in words is "seventy-one million, six hundred thirteen thousand, nine hundred forty".