81054440 has 16 divisors (see below), whose sum is σ = 182372580. Its totient is φ = 32421760.

The previous prime is 81054439. The next prime is 81054443. The reversal of 81054440 is 4445018.

It can be written as a sum of positive squares in 2 ways, for example, as 68790436 + 12264004 = 8294^2 + 3502^2 .

It is not an unprimeable number, because it can be changed into a prime (81054443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013141 + ... + 1013220.

Almost surely, 2^81054440 is an apocalyptic number.

It is an amenable number.

81054440 is an abundant number, since it is smaller than the sum of its proper divisors (101318140).

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

81054440 is a wasteful number, since it uses less digits than its factorization.

81054440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026372 (or 2026368 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 81054440 is about 9003.0239364338. The cubic root of 81054440 is about 432.7717827996.

Adding to 81054440 its reverse (4445018), we get a palindrome (85499458).

The spelling of 81054440 in words is "eighty-one million, fifty-four thousand, four hundred forty".