80205945 has 32 divisors (see below), whose sum is σ = 134479872. Its totient is φ = 40742592.

The previous prime is 80205941. The next prime is 80205947. The reversal of 80205945 is 54950208.

It is not a de Polignac number, because 80205945 - 2² = 80205941 is a prime.

It is a super-2 number, since 2×80205945² = 12865987226686050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80205941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131832 + ... + 132438.

It is an arithmetic number, because the mean of its divisors is an integer number (4202496).

Almost surely, 2^80205945 is an apocalyptic number.

It is an amenable number.

80205945 is a deficient number, since it is larger than the sum of its proper divisors (54273927).

80205945 is a wasteful number, since it uses less digits than its factorization.

80205945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 80205945 is about 8955.7771857053. Note that the first 3 decimals coincide. The cubic root of 80205945 is about 431.2563670558.

The spelling of 80205945 in words is "eighty million, two hundred five thousand, nine hundred forty-five".