81796900 has 36 divisors (see below), whose sum is σ = 186845680. Its totient is φ = 30996000.

The previous prime is 81796867. The next prime is 81796903. The reversal of 81796900 is 969718.

It is a super-2 number, since 2×81796900² = 13381465699220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81796903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19626 + ... + 23425.

Almost surely, 2^81796900 is an apocalyptic number.

It is an amenable number.

81796900 is an abundant number, since it is smaller than the sum of its proper divisors (105048780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81796900 is a wasteful number, since it uses less digits than its factorization.

81796900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43084 (or 43077 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 81796900 is about 9044.1638640617. The cubic root of 81796900 is about 434.0891674052.

It can be divided in two parts, 81796 and 900, that multiplied together give a square (73616400 = 8580²).

The spelling of 81796900 in words is "eighty-one million, seven hundred ninety-six thousand, nine hundred".