81025936 has 10 divisors (see below), whose sum is σ = 156987782. Its totient is φ = 40512960.

The previous prime is 81025891. The next prime is 81025949. The reversal of 81025936 is 63952018.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 36723600 = 6656^2 + 6060^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2532045 + ... + 2532076.

Almost surely, 2^81025936 is an apocalyptic number.

It is an amenable number.

81025936 is a deficient number, since it is larger than the sum of its proper divisors (75961846).

81025936 is a wasteful number, since it uses less digits than its factorization.

81025936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064129 (or 5064123 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 81025936 is about 9001.4407735651. The cubic root of 81025936 is about 432.7210466393.

The spelling of 81025936 in words is "eighty-one million, twenty-five thousand, nine hundred thirty-six".