80711505 has 64 divisors (see below), whose sum is σ = 165150720. Its totient is φ = 36635328.

The previous prime is 80711497. The next prime is 80711537. The reversal of 80711505 is 50511708.

It is not a de Polignac number, because 80711505 - 2³ = 80711497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 210544 + ... + 210926.

It is an arithmetic number, because the mean of its divisors is an integer number (2580480).

Almost surely, 2^80711505 is an apocalyptic number.

It is an amenable number.

80711505 is an abundant number, since it is smaller than the sum of its proper divisors (84439215).

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

80711505 is a wasteful number, since it uses less digits than its factorization.

80711505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 80711505 is about 8983.9582033756. The cubic root of 80711505 is about 432.1605788069.

The spelling of 80711505 in words is "eighty million, seven hundred eleven thousand, five hundred five".