81025120 has 96 divisors (see below), whose sum is σ = 219905280. Its totient is φ = 27901440.

The previous prime is 81025117. The next prime is 81025121. The reversal of 81025120 is 2152018.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81025121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32229 + ... + 34651.

It is an arithmetic number, because the mean of its divisors is an integer number (2290680).

Almost surely, 2^81025120 is an apocalyptic number.

81025120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81025120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109952640).

81025120 is an abundant number, since it is smaller than the sum of its proper divisors (138880160).

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

81025120 is a wasteful number, since it uses less digits than its factorization.

81025120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468 (or 2460 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 81025120 is about 9001.3954473737. The cubic root of 81025120 is about 432.7195940116.

Adding to 81025120 its reverse (2152018), we get a palindrome (83177138).

The spelling of 81025120 in words is "eighty-one million, twenty-five thousand, one hundred twenty".