2321997678 has 448 divisors, whose sum is σ = 7368463872. Its totient is φ = 529079040.

The previous prime is 2321997659. The next prime is 2321997707. The reversal of 2321997678 is 8767991232.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 53999925 + ... + 53999967.

It is an arithmetic number, because the mean of its divisors is an integer number (16447464).

Almost surely, 2^2321997678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2321997678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3684231936).

2321997678 is an abundant number, since it is smaller than the sum of its proper divisors (5046466194).

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

2321997678 is a wasteful number, since it uses less digits than its factorization.

2321997678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 116 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 2321997678 is about 48187.1111190534. Note that the first 5 decimals coincide. The cubic root of 2321997678 is about 1324.2010473320.

It can be divided in two parts, 2321 and 997678, that added together give a palindrome (999999).

The spelling of 2321997678 in words is "two billion, three hundred twenty-one million, nine hundred ninety-seven thousand, six hundred seventy-eight".