81970026 has 8 divisors (see below), whose sum is σ = 163940064. Its totient is φ = 27323340.

The previous prime is 81970019. The next prime is 81970027. The reversal of 81970026 is 62007918.

It is a sphenic number, since it is the product of 3 distinct primes.

81970026 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81970027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6830830 + ... + 6830841.

It is an arithmetic number, because the mean of its divisors is an integer number (20492508).

Almost surely, 2^81970026 is an apocalyptic number.

81970026 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81970026 is a wasteful number, since it uses less digits than its factorization.

81970026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13661676.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81970026 is about 9053.7299495843. The cubic root of 81970026 is about 434.3952065613.

The spelling of 81970026 in words is "eighty-one million, nine hundred seventy thousand, twenty-six".