81925067 has 24 divisors (see below), whose sum is σ = 98332416. Its totient is φ = 66845088.

The previous prime is 81925049. The next prime is 81925069. The reversal of 81925067 is 76052918.

It is not a de Polignac number, because 81925067 - 2¹⁴ = 81908683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81925067.

It is not an unprimeable number, because it can be changed into a prime (81925069) 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 23 ways as a sum of consecutive naturals, for example, 795338 + ... + 795440.

It is an arithmetic number, because the mean of its divisors is an integer number (4097184).

Almost surely, 2^81925067 is an apocalyptic number.

81925067 is a deficient number, since it is larger than the sum of its proper divisors (16407349).

81925067 is a wasteful number, since it uses less digits than its factorization.

81925067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 81925067 is about 9051.2467097080. The cubic root of 81925067 is about 434.3157728677.

The spelling of 81925067 in words is "eighty-one million, nine hundred twenty-five thousand, sixty-seven".