80640711 has 16 divisors (see below), whose sum is σ = 120332800. Its totient is φ = 53371224.

The previous prime is 80640709. The next prime is 80640713. The reversal of 80640711 is 11704608.

It is a happy number.

80640711 is a `hidden beast` number, since 8 + 0 + 640 + 7 + 11 = 666.

It is an interprime number because it is at equal distance from previous prime (80640709) and next prime (80640713).

It is not a de Polignac number, because 80640711 - 2¹ = 80640709 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80640713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6991 + ... + 14496.

It is an arithmetic number, because the mean of its divisors is an integer number (7520800).

Almost surely, 2^80640711 is an apocalyptic number.

80640711 is a deficient number, since it is larger than the sum of its proper divisors (39692089).

80640711 is a wasteful number, since it uses less digits than its factorization.

80640711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21635 (or 21629 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 80640711 is about 8980.0173162417. The cubic root of 80640711 is about 432.0341890380.

The spelling of 80640711 in words is "eighty million, six hundred forty thousand, seven hundred eleven".