819778055 has 8 divisors (see below), whose sum is σ = 983887344. Its totient is φ = 655720000.

The previous prime is 819778027. The next prime is 819778081. The reversal of 819778055 is 550877918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 819778055 - 2¹⁰ = 819777031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 819777994 and 819778012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56555 + ... + 69555.

It is an arithmetic number, because the mean of its divisors is an integer number (122985918).

Almost surely, 2^819778055 is an apocalyptic number.

819778055 is a deficient number, since it is larger than the sum of its proper divisors (164109289).

819778055 is a wasteful number, since it uses less digits than its factorization.

819778055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25617.

The product of its (nonzero) digits is 705600, while the sum is 50.

The square root of 819778055 is about 28631.7665364888. The cubic root of 819778055 is about 935.9057082158.

The spelling of 819778055 in words is "eight hundred nineteen million, seven hundred seventy-eight thousand, fifty-five".