81670908 has 24 divisors (see below), whose sum is σ = 207889920. Its totient is φ = 24748720.

The previous prime is 81670891. The next prime is 81670909. The reversal of 81670908 is 80907618.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81670909) 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, 309228 + ... + 309491.

It is an arithmetic number, because the mean of its divisors is an integer number (8662080).

Almost surely, 2^81670908 is an apocalyptic number.

It is an amenable number.

81670908 is an abundant number, since it is smaller than the sum of its proper divisors (126219012).

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

81670908 is a wasteful number, since it uses less digits than its factorization.

81670908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618737 (or 618735 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 81670908 is about 9037.1958040091. The cubic root of 81670908 is about 433.8661766111.

The spelling of 81670908 in words is "eighty-one million, six hundred seventy thousand, nine hundred eight".