2064006781 has 4 divisors (see below), whose sum is σ = 2083296672. Its totient is φ = 2044716892.

The previous prime is 2064006767. The next prime is 2064006793. The reversal of 2064006781 is 1876004602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2064006781 - 2¹⁵ = 2063974013 is a prime.

It is a super-2 number, since 2×2064006781² = 8520247984027963922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2064006881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9644785 + ... + 9644998.

It is an arithmetic number, because the mean of its divisors is an integer number (520824168).

Almost surely, 2^2064006781 is an apocalyptic number.

It is an amenable number.

2064006781 is a deficient number, since it is larger than the sum of its proper divisors (19289891).

2064006781 is a wasteful number, since it uses less digits than its factorization.

2064006781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19289890.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 2064006781 is about 45431.3413955608. The cubic root of 2064006781 is about 1273.2207464133.

The spelling of 2064006781 in words is "two billion, sixty-four million, six thousand, seven hundred eighty-one".