81995932 has 6 divisors (see below), whose sum is σ = 143492888. Its totient is φ = 40997964.

The previous prime is 81995923. The next prime is 81995939. The reversal of 81995932 is 23959918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81995939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10249488 + ... + 10249495.

Almost surely, 2^81995932 is an apocalyptic number.

It is an amenable number.

81995932 is a deficient number, since it is larger than the sum of its proper divisors (61496956).

81995932 is a wasteful number, since it uses less digits than its factorization.

81995932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20498987 (or 20498985 counting only the distinct ones).

The product of its digits is 174960, while the sum is 46.

The square root of 81995932 is about 9055.1605176275. The cubic root of 81995932 is about 434.4409641692.

The spelling of 81995932 in words is "eighty-one million, nine hundred ninety-five thousand, nine hundred thirty-two".