80659990 has 16 divisors (see below), whose sum is σ = 148277952. Its totient is φ = 31577344.

The previous prime is 80659979. The next prime is 80659993. The reversal of 80659990 is 9995608.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 80659990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80659993) 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 7 ways as a sum of consecutive naturals, for example, 85339 + ... + 86278.

It is an arithmetic number, because the mean of its divisors is an integer number (9267372).

Almost surely, 2^80659990 is an apocalyptic number.

80659990 is a deficient number, since it is larger than the sum of its proper divisors (67617962).

80659990 is a wasteful number, since it uses less digits than its factorization.

80659990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171671.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 80659990 is about 8981.0906910018. The cubic root of 80659990 is about 432.0686155014.

The spelling of 80659990 in words is "eighty million, six hundred fifty-nine thousand, nine hundred ninety".