81546120 has 96 divisors (see below), whose sum is σ = 273611520. Its totient is φ = 21041280.

The previous prime is 81546107. The next prime is 81546131. The reversal of 81546120 is 2164518.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7507 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (2850120).

Almost surely, 2^81546120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81546120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136805760).

81546120 is an abundant number, since it is smaller than the sum of its proper divisors (192065400).

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

81546120 is a wasteful number, since it uses less digits than its factorization.

81546120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7355 (or 7348 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81546120 is about 9030.2890319192. The cubic root of 81546120 is about 433.6450905800.

The spelling of 81546120 in words is "eighty-one million, five hundred forty-six thousand, one hundred twenty".