81795412 has 6 divisors (see below), whose sum is σ = 143141978. Its totient is φ = 40897704.

The previous prime is 81795407. The next prime is 81795473. The reversal of 81795412 is 21459718.

81795412 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 40373316 = 6436^2 + 6354^2 .

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, 10224423 + ... + 10224430.

Almost surely, 2^81795412 is an apocalyptic number.

It is an amenable number.

81795412 is a deficient number, since it is larger than the sum of its proper divisors (61346566).

81795412 is a wasteful number, since it uses less digits than its factorization.

81795412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20448857 (or 20448855 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 81795412 is about 9044.0816006934. The cubic root of 81795412 is about 434.0865351596.

The spelling of 81795412 in words is "eighty-one million, seven hundred ninety-five thousand, four hundred twelve".