80634985 has 16 divisors (see below), whose sum is σ = 98846352. Its totient is φ = 63129600.

The previous prime is 80634949. The next prime is 80634989. The reversal of 80634985 is 58943608.

It can be written as a sum of positive squares in 8 ways, for example, as 9603801 + 71031184 = 3099^2 + 8428^2 .

It is not a de Polignac number, because 80634985 - 2⁷ = 80634857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80634989) 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, 72957 + ... + 74053.

It is an arithmetic number, because the mean of its divisors is an integer number (6177897).

Almost surely, 2^80634985 is an apocalyptic number.

It is an amenable number.

80634985 is a deficient number, since it is larger than the sum of its proper divisors (18211367).

80634985 is a wasteful number, since it uses less digits than its factorization.

80634985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 80634985 is about 8979.6984915976. The cubic root of 80634985 is about 432.0239630769.

The spelling of 80634985 in words is "eighty million, six hundred thirty-four thousand, nine hundred eighty-five".