81280407 has 16 divisors (see below), whose sum is σ = 118026720. Its totient is φ = 49454592.

The previous prime is 81280373. The next prime is 81280421. The reversal of 81280407 is 70408218.

It is not a de Polignac number, because 81280407 - 2⁷ = 81280279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81280477) 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, 8238 + ... + 15179.

It is an arithmetic number, because the mean of its divisors is an integer number (7376670).

Almost surely, 2^81280407 is an apocalyptic number.

81280407 is a deficient number, since it is larger than the sum of its proper divisors (36746313).

81280407 is a wasteful number, since it uses less digits than its factorization.

81280407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23522.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81280407 is about 9015.5647077707. The cubic root of 81280407 is about 433.1735761522.

The spelling of 81280407 in words is "eighty-one million, two hundred eighty thousand, four hundred seven".