81467625 has 32 divisors (see below), whose sum is σ = 138153600. Its totient is φ = 42619200.

The previous prime is 81467623. The next prime is 81467629. The reversal of 81467625 is 52676418.

It is not a de Polignac number, because 81467625 - 2¹ = 81467623 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81467623) 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, 17826 + ... + 21924.

It is an arithmetic number, because the mean of its divisors is an integer number (4317300).

Almost surely, 2^81467625 is an apocalyptic number.

It is an amenable number.

81467625 is a deficient number, since it is larger than the sum of its proper divisors (56685975).

81467625 is a wasteful number, since it uses less digits than its factorization.

81467625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170 (or 4160 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 81467625 is about 9025.9417791165. The cubic root of 81467625 is about 433.5059059525.

The spelling of 81467625 in words is "eighty-one million, four hundred sixty-seven thousand, six hundred twenty-five".