80649679 has 4 divisors (see below), whose sum is σ = 87981480. Its totient is φ = 73317880.

The previous prime is 80649671. The next prime is 80649713. The reversal of 80649679 is 97694608.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80649679 - 2³ = 80649671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80649671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665884 + ... + 3665905.

It is an arithmetic number, because the mean of its divisors is an integer number (21995370).

Almost surely, 2^80649679 is an apocalyptic number.

80649679 is a deficient number, since it is larger than the sum of its proper divisors (7331801).

80649679 is a wasteful number, since it uses less digits than its factorization.

80649679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7331800.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 80649679 is about 8980.5166332456. The cubic root of 80649679 is about 432.0502038562.

The spelling of 80649679 in words is "eighty million, six hundred forty-nine thousand, six hundred seventy-nine".