71081616 has 40 divisors (see below), whose sum is σ = 184675680. Its totient is φ = 23558656.

The previous prime is 71081611. The next prime is 71081629. The reversal of 71081616 is 61618017.

It is a happy number.

It is a super-2 number, since 2×71081616² = 10105192266342912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71081611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4456 + ... + 12728.

It is an arithmetic number, because the mean of its divisors is an integer number (4616892).

Almost surely, 2^71081616 is an apocalyptic number.

It is an amenable number.

71081616 is an abundant number, since it is smaller than the sum of its proper divisors (113594064).

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

71081616 is a wasteful number, since it uses less digits than its factorization.

71081616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8463 (or 8457 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 71081616 is about 8430.9914007784. The cubic root of 71081616 is about 414.2403794342.

The spelling of 71081616 in words is "seventy-one million, eighty-one thousand, six hundred sixteen".