80820447 has 4 divisors (see below), whose sum is σ = 107760600. Its totient is φ = 53880296.

The previous prime is 80820437. The next prime is 80820457. The reversal of 80820447 is 74402808.

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

It is an interprime number because it is at equal distance from previous prime (80820437) and next prime (80820457).

It is a cyclic number.

It is not a de Polignac number, because 80820447 - 2¹¹ = 80818399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80820407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13470072 + ... + 13470077.

It is an arithmetic number, because the mean of its divisors is an integer number (26940150).

Almost surely, 2^80820447 is an apocalyptic number.

80820447 is a deficient number, since it is larger than the sum of its proper divisors (26940153).

80820447 is a wasteful number, since it uses less digits than its factorization.

80820447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26940152.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 80820447 is about 8990.0192992006. The cubic root of 80820447 is about 432.3549305748.

The spelling of 80820447 in words is "eighty million, eight hundred twenty thousand, four hundred forty-seven".