81053420 has 48 divisors (see below), whose sum is σ = 195084288. Its totient is φ = 27710400.

The previous prime is 81053407. The next prime is 81053459. The reversal of 81053420 is 2435018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69845 + ... + 70995.

It is an arithmetic number, because the mean of its divisors is an integer number (4064256).

Almost surely, 2^81053420 is an apocalyptic number.

It is an amenable number.

81053420 is an abundant number, since it is smaller than the sum of its proper divisors (114030868).

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

81053420 is a wasteful number, since it uses less digits than its factorization.

81053420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 81053420 is about 9002.9672886221. The cubic root of 81053420 is about 432.7699674392.

Adding to 81053420 its reverse (2435018), we get a palindrome (83488438).

The spelling of 81053420 in words is "eighty-one million, fifty-three thousand, four hundred twenty".