2389778478 has 20 divisors (see below), whose sum is σ = 5354874360. Its totient is φ = 796592772.

The previous prime is 2389778471. The next prime is 2389778507. The reversal of 2389778478 is 8748779832.

2389778478 is a `hidden beast` number, since 2 + 3 + 8 + 97 + 78 + 478 = 666.

It is a super-2 number, since 2×2389778478² = 11422082347823992968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2389778471) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 7375698 + ... + 7376021.

It is an arithmetic number, because the mean of its divisors is an integer number (267743718).

Almost surely, 2^2389778478 is an apocalyptic number.

2389778478 is an abundant number, since it is smaller than the sum of its proper divisors (2965095882).

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

2389778478 is a wasteful number, since it uses less digits than its factorization.

2389778478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14751733 (or 14751724 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The square root of 2389778478 is about 48885.3605693975. The cubic root of 2389778478 is about 1336.9624665956.

The spelling of 2389778478 in words is "two billion, three hundred eighty-nine million, seven hundred seventy-eight thousand, four hundred seventy-eight".