81208974 has 48 divisors (see below), whose sum is σ = 206119296. Its totient is φ = 21092400.

The previous prime is 81208951. The next prime is 81208979. The reversal of 81208974 is 47980218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81208979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9322 + ... + 15789.

It is an arithmetic number, because the mean of its divisors is an integer number (4294152).

Almost surely, 2^81208974 is an apocalyptic number.

81208974 is an abundant number, since it is smaller than the sum of its proper divisors (124910322).

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

81208974 is a wasteful number, since it uses less digits than its factorization.

81208974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25141 (or 25134 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 81208974 is about 9011.6021882904. The cubic root of 81208974 is about 433.0466412679.

The spelling of 81208974 in words is "eighty-one million, two hundred eight thousand, nine hundred seventy-four".