797647878 has 64 divisors (see below), whose sum is σ = 1802243520. Its totient is φ = 261467136.

The previous prime is 797647861. The next prime is 797647883. The reversal of 797647878 is 878746797.

797647878 is a `hidden beast` number, since 7 + 97 + 6 + 478 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1031500 + ... + 1032272.

It is an arithmetic number, because the mean of its divisors is an integer number (28160055).

Almost surely, 2^797647878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 797647878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901121760).

797647878 is an abundant number, since it is smaller than the sum of its proper divisors (1004595642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

797647878 is a wasteful number, since it uses less digits than its factorization.

797647878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078 (or 1072 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 63.

The square root of 797647878 is about 28242.6606041286. The cubic root of 797647878 is about 927.4070750135.

The spelling of 797647878 in words is "seven hundred ninety-seven million, six hundred forty-seven thousand, eight hundred seventy-eight".