81081270 has 32 divisors (see below), whose sum is σ = 216217440. Its totient is φ = 21621600.

The previous prime is 81081269. The next prime is 81081307. The reversal of 81081270 is 7218018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 149881 + ... + 150420.

It is an arithmetic number, because the mean of its divisors is an integer number (6756795).

Almost surely, 2^81081270 is an apocalyptic number.

81081270 is an abundant number, since it is smaller than the sum of its proper divisors (135136170).

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

81081270 is a wasteful number, since it uses less digits than its factorization.

81081270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300317 (or 300311 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 81081270 is about 9004.5138680553. The cubic root of 81081270 is about 432.8195284300.

Adding to 81081270 its reverse (7218018), we get a palindrome (88299288).

The spelling of 81081270 in words is "eighty-one million, eighty-one thousand, two hundred seventy".