81928600 has 48 divisors (see below), whose sum is σ = 205143120. Its totient is φ = 30249600.

The previous prime is 81928591. The next prime is 81928601. The reversal of 81928600 is 682918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81928601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13156 + ... + 18355.

It is an arithmetic number, because the mean of its divisors is an integer number (4273815).

Almost surely, 2^81928600 is an apocalyptic number.

It is an amenable number.

81928600 is an abundant number, since it is smaller than the sum of its proper divisors (123214520).

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

81928600 is a wasteful number, since it uses less digits than its factorization.

81928600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31540 (or 31531 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81928600 is about 9051.4418740883. The cubic root of 81928600 is about 434.3220160345.

It can be divided in two parts, 81928 and 600, that added together give a palindrome (82528).

The spelling of 81928600 in words is "eighty-one million, nine hundred twenty-eight thousand, six hundred".