81827672 has 8 divisors (see below), whose sum is σ = 153426900. Its totient is φ = 40913832.

The previous prime is 81827663. The next prime is 81827687. The reversal of 81827672 is 27672818.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5114222 + ... + 5114237.

Almost surely, 2^81827672 is an apocalyptic number.

It is an amenable number.

81827672 is a deficient number, since it is larger than the sum of its proper divisors (71599228).

81827672 is a wasteful number, since it uses less digits than its factorization.

81827672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10228465 (or 10228461 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 81827672 is about 9045.8649116599. The cubic root of 81827672 is about 434.1435953731.

The spelling of 81827672 in words is "eighty-one million, eight hundred twenty-seven thousand, six hundred seventy-two".