81795908 has 12 divisors (see below), whose sum is σ = 151563132. Its totient is φ = 38492160.

The previous prime is 81795877. The next prime is 81795911. The reversal of 81795908 is 80959718.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68194564 + 13601344 = 8258^2 + 3688^2 .

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, 601373 + ... + 601508.

It is an arithmetic number, because the mean of its divisors is an integer number (12630261).

Almost surely, 2^81795908 is an apocalyptic number.

It is an amenable number.

81795908 is a deficient number, since it is larger than the sum of its proper divisors (69767224).

81795908 is a wasteful number, since it uses less digits than its factorization.

81795908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202902 (or 1202900 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 81795908 is about 9044.1090218993. The cubic root of 81795908 is about 434.0874125783.

The spelling of 81795908 in words is "eighty-one million, seven hundred ninety-five thousand, nine hundred eight".