81960063 has 16 divisors (see below), whose sum is σ = 117712896. Its totient is φ = 50577120.

The previous prime is 81960049. The next prime is 81960071. The reversal of 81960063 is 36006918.

It is not a de Polignac number, because 81960063 - 2²² = 77765759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81960163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17020 + ... + 21297.

It is an arithmetic number, because the mean of its divisors is an integer number (7357056).

Almost surely, 2^81960063 is an apocalyptic number.

81960063 is a deficient number, since it is larger than the sum of its proper divisors (35752833).

81960063 is a wasteful number, since it uses less digits than its factorization.

81960063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38374.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 81960063 is about 9053.1797176462. The cubic root of 81960063 is about 434.3776064091.

The spelling of 81960063 in words is "eighty-one million, nine hundred sixty thousand, sixty-three".