81053380 has 72 divisors (see below), whose sum is σ = 182835072. Its totient is φ = 30165696.

The previous prime is 81053363. The next prime is 81053383. The reversal of 81053380 is 8335018.

It is not an unprimeable number, because it can be changed into a prime (81053383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497179 + ... + 497341.

It is an arithmetic number, because the mean of its divisors is an integer number (2539376).

Almost surely, 2^81053380 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 81053380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91417536).

81053380 is an abundant number, since it is smaller than the sum of its proper divisors (101781692).

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

81053380 is a wasteful number, since it uses less digits than its factorization.

81053380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81053380 is about 9002.9650671321. The cubic root of 81053380 is about 432.7698962483.

Adding to 81053380 its reverse (8335018), we get a palindrome (89388398).

The spelling of 81053380 in words is "eighty-one million, fifty-three thousand, three hundred eighty".