80788905 has 24 divisors (see below), whose sum is σ = 140554440. Its totient is φ = 42927360.

The previous prime is 80788889. The next prime is 80788909. The reversal of 80788905 is 50988708.

It can be written as a sum of positive squares in 4 ways, for example, as 166464 + 80622441 = 408^2 + 8979^2 .

It is not a de Polignac number, because 80788905 - 2⁴ = 80788889 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (80788909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9451 + ... + 15839.

It is an arithmetic number, because the mean of its divisors is an integer number (5856435).

Almost surely, 2^80788905 is an apocalyptic number.

It is an amenable number.

80788905 is a deficient number, since it is larger than the sum of its proper divisors (59765535).

80788905 is a wasteful number, since it uses less digits than its factorization.

80788905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6681 (or 6678 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 80788905 is about 8988.2648492354. The cubic root of 80788905 is about 432.2986778392.

The spelling of 80788905 in words is "eighty million, seven hundred eighty-eight thousand, nine hundred five".