81788345 has 16 divisors (see below), whose sum is σ = 103030272. Its totient is φ = 62208960.

The previous prime is 81788321. The next prime is 81788351. The reversal of 81788345 is 54388718.

It is not a de Polignac number, because 81788345 - 2⁶ = 81788281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81788296 and 81788305.

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, 17840 + ... + 21950.

It is an arithmetic number, because the mean of its divisors is an integer number (6439392).

Almost surely, 2^81788345 is an apocalyptic number.

It is an amenable number.

81788345 is a deficient number, since it is larger than the sum of its proper divisors (21241927).

81788345 is a wasteful number, since it uses less digits than its factorization.

81788345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312.

The product of its digits is 215040, while the sum is 44.

The square root of 81788345 is about 9043.6908947619. The cubic root of 81788345 is about 434.0740333259.

The spelling of 81788345 in words is "eighty-one million, seven hundred eighty-eight thousand, three hundred forty-five".