80640642 has 32 divisors (see below), whose sum is σ = 164783808. Its totient is φ = 26302976.

The previous prime is 80640629. The next prime is 80640647. The reversal of 80640642 is 24604608.

It is not an unprimeable number, because it can be changed into a prime (80640647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55558 + ... + 56990.

It is an arithmetic number, because the mean of its divisors is an integer number (5149494).

Almost surely, 2^80640642 is an apocalyptic number.

80640642 is an abundant number, since it is smaller than the sum of its proper divisors (84143166).

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

80640642 is a wasteful number, since it uses less digits than its factorization.

80640642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 80640642 is about 8980.0134743774. The cubic root of 80640642 is about 432.0340658150.

The spelling of 80640642 in words is "eighty million, six hundred forty thousand, six hundred forty-two".