81926005 has 32 divisors (see below), whose sum is σ = 118944000. Its totient is φ = 52918272.

The previous prime is 81926003. The next prime is 81926041. The reversal of 81926005 is 50062918.

It is a cyclic number.

It is not a de Polignac number, because 81926005 - 2¹ = 81926003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81926003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231909 + ... + 232261.

It is an arithmetic number, because the mean of its divisors is an integer number (3717000).

Almost surely, 2^81926005 is an apocalyptic number.

It is an amenable number.

81926005 is a deficient number, since it is larger than the sum of its proper divisors (37017995).

81926005 is a wasteful number, since it uses less digits than its factorization.

81926005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 81926005 is about 9051.2985256260. The cubic root of 81926005 is about 434.3174304257.

The spelling of 81926005 in words is "eighty-one million, nine hundred twenty-six thousand, five".