80649999 has 16 divisors (see below), whose sum is σ = 120959840. Its totient is φ = 53765208.

The previous prime is 80649997. The next prime is 80650001. The reversal of 80649999 is 99994608.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (80649997) and next prime (80650001).

It is not a de Polignac number, because 80649999 - 2¹ = 80649997 is a prime.

It is a Duffinian number.

80649999 is a modest number, since divided by 9999 gives 8064 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80649997) 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, 16252 + ... + 20625.

It is an arithmetic number, because the mean of its divisors is an integer number (7559990).

Almost surely, 2^80649999 is an apocalyptic number.

80649999 is a deficient number, since it is larger than the sum of its proper divisors (40309841).

80649999 is an frugal number, since it uses more digits than its factorization.

80649999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36898 (or 36880 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 80649999 is about 8980.5344495748. The cubic root of 80649999 is about 432.0507752819.

It can be divided in two parts, 806 and 49999, that added together give a palindrome (50805).

The spelling of 80649999 in words is "eighty million, six hundred forty-nine thousand, nine hundred ninety-nine".