2064810978 has 72 divisors (see below), whose sum is σ = 4748520348. Its totient is φ = 648333504.

The previous prime is 2064810971. The next prime is 2064810983. The reversal of 2064810978 is 8790184602.

It can be written as a sum of positive squares in 2 ways, for example, as 1774347129 + 290463849 = 42123^2 + 17043^2 .

It is not an unprimeable number, because it can be changed into a prime (2064810971) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1279300 + ... + 1280912.

Almost surely, 2^2064810978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2064810978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2374260174).

2064810978 is an abundant number, since it is smaller than the sum of its proper divisors (2683709370).

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

2064810978 is a wasteful number, since it uses less digits than its factorization.

2064810978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 2064810978 is about 45440.1912187878. The cubic root of 2064810978 is about 1273.3860862045.

It can be divided in two parts, 20648 and 10978, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 2064810978 in words is "two billion, sixty-four million, eight hundred ten thousand, nine hundred seventy-eight".