81395708 has 48 divisors (see below), whose sum is σ = 153318144. Its totient is φ = 37739520.

The previous prime is 81395683. The next prime is 81395729. The reversal of 81395708 is 80759318.

It is a happy number.

It is a super-2 number, since 2×81395708² = 13250522561642528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518366 + ... + 518522.

It is an arithmetic number, because the mean of its divisors is an integer number (3194128).

Almost surely, 2^81395708 is an apocalyptic number.

It is an amenable number.

81395708 is a deficient number, since it is larger than the sum of its proper divisors (71922436).

81395708 is a wasteful number, since it uses less digits than its factorization.

81395708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 81395708 is about 9021.9569939121. The cubic root of 81395708 is about 433.3783067064.

The spelling of 81395708 in words is "eighty-one million, three hundred ninety-five thousand, seven hundred eight".