81024625 has 32 divisors (see below), whose sum is σ = 111451392. Its totient is φ = 58806000.

The previous prime is 81024623. The next prime is 81024631. The reversal of 81024625 is 52642018.

It is not a de Polignac number, because 81024625 - 2¹ = 81024623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81024593 and 81024602.

It is not an unprimeable number, because it can be changed into a prime (81024623) 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 31 ways as a sum of consecutive naturals, for example, 166132 + ... + 166618.

It is an arithmetic number, because the mean of its divisors is an integer number (3482856).

Almost surely, 2^81024625 is an apocalyptic number.

It is an amenable number.

81024625 is a deficient number, since it is larger than the sum of its proper divisors (30426767).

81024625 is an equidigital number, since it uses as much as digits as its factorization.

81024625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 81024625 is about 9001.3679515949. The cubic root of 81024625 is about 432.7187128172.

The spelling of 81024625 in words is "eighty-one million, twenty-four thousand, six hundred twenty-five".