81260812 has 6 divisors (see below), whose sum is σ = 142206428. Its totient is φ = 40630404.

The previous prime is 81260789. The next prime is 81260821. The reversal of 81260812 is 21806218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157598 + ... + 10157605.

Almost surely, 2^81260812 is an apocalyptic number.

It is an amenable number.

81260812 is a deficient number, since it is larger than the sum of its proper divisors (60945616).

81260812 is a wasteful number, since it uses less digits than its factorization.

81260812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20315207 (or 20315205 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81260812 is about 9014.4779105614. The cubic root of 81260812 is about 433.1387636690.

The spelling of 81260812 in words is "eighty-one million, two hundred sixty thousand, eight hundred twelve".