80640723 has 16 divisors (see below), whose sum is σ = 111535776. Its totient is φ = 51782400.

The previous prime is 80640713. The next prime is 80640739. The reversal of 80640723 is 32704608.

It is not a de Polignac number, because 80640723 - 2⁸ = 80640467 is a prime.

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, 7615 + ... + 14807.

It is an arithmetic number, because the mean of its divisors is an integer number (6970986).

Almost surely, 2^80640723 is an apocalyptic number.

80640723 is a deficient number, since it is larger than the sum of its proper divisors (30895053).

80640723 is a wasteful number, since it uses less digits than its factorization.

80640723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 80640723 is about 8980.0179843918. The cubic root of 80640723 is about 432.0342104681.

The spelling of 80640723 in words is "eighty million, six hundred forty thousand, seven hundred twenty-three".