817820054 has 16 divisors (see below), whose sum is σ = 1299509568. Its totient is φ = 384673152.

The previous prime is 817820027. The next prime is 817820099. The reversal of 817820054 is 450028718.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 817819996 and 817820023.

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, 89732 + ... + 98424.

It is an arithmetic number, because the mean of its divisors is an integer number (81219348).

Almost surely, 2^817820054 is an apocalyptic number.

817820054 is a deficient number, since it is larger than the sum of its proper divisors (481689514).

817820054 is a wasteful number, since it uses less digits than its factorization.

817820054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11479.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 817820054 is about 28597.5532869510. The cubic root of 817820054 is about 935.1599920673.

The spelling of 817820054 in words is "eight hundred seventeen million, eight hundred twenty thousand, fifty-four".