81345378 has 16 divisors (see below), whose sum is σ = 162983520. Its totient is φ = 27066336.

The previous prime is 81345349. The next prime is 81345389. The reversal of 81345378 is 87354318.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8500 + ... + 15327.

It is an arithmetic number, because the mean of its divisors is an integer number (10186470).

Almost surely, 2^81345378 is an apocalyptic number.

81345378 is an abundant number, since it is smaller than the sum of its proper divisors (81638142).

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

81345378 is a wasteful number, since it uses less digits than its factorization.

81345378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24401.

The product of its digits is 80640, while the sum is 39.

The square root of 81345378 is about 9019.1672564600. The cubic root of 81345378 is about 433.2889636359.

The spelling of 81345378 in words is "eighty-one million, three hundred forty-five thousand, three hundred seventy-eight".