81964628927 has 8 divisors (see below), whose sum is σ = 82361715072. Its totient is φ = 81567624600.

The previous prime is 81964628899. The next prime is 81964628929. The reversal of 81964628927 is 72982646918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81964628927 - 2²⁶ = 81897520063 is a prime.

It is a super-3 number, since 3×81964628927³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81964628927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81964628929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3212852 + ... + 3238262.

It is an arithmetic number, because the mean of its divisors is an integer number (10295214384).

Almost surely, 2^81964628927 is an apocalyptic number.

81964628927 is a deficient number, since it is larger than the sum of its proper divisors (397086145).

81964628927 is a wasteful number, since it uses less digits than its factorization.

81964628927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40909.

The product of its digits is 20901888, while the sum is 62.

The spelling of 81964628927 in words is "eighty-one billion, nine hundred sixty-four million, six hundred twenty-eight thousand, nine hundred twenty-seven".