12820478 has 16 divisors (see below), whose sum is σ = 22083840. Its totient is φ = 5520600.

The previous prime is 12820427. The next prime is 12820481. The reversal of 12820478 is 87402821.

It is a super-2 number, since 2×12820478² = 328729312296968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14918 + ... + 15753.

It is an arithmetic number, because the mean of its divisors is an integer number (1380240).

Almost surely, 2^12820478 is an apocalyptic number.

12820478 is a deficient number, since it is larger than the sum of its proper divisors (9263362).

12820478 is a wasteful number, since it uses less digits than its factorization.

12820478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30703.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 12820478 is about 3580.5695077739. The cubic root of 12820478 is about 234.0460984982.

The spelling of 12820478 in words is "twelve million, eight hundred twenty thousand, four hundred seventy-eight".