2604636785 has 4 divisors (see below), whose sum is σ = 3125564148. Its totient is φ = 2083709424.

The previous prime is 2604636763. The next prime is 2604636799. The reversal of 2604636785 is 5876364062.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1592887921 + 1011748864 = 39911^2 + 31808^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604636785 - 2²⁶ = 2537527921 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 260463674 + ... + 260463683.

It is an arithmetic number, because the mean of its divisors is an integer number (781391037).

Almost surely, 2^2604636785 is an apocalyptic number.

It is an amenable number.

2604636785 is a deficient number, since it is larger than the sum of its proper divisors (520927363).

2604636785 is an equidigital number, since it uses as much as digits as its factorization.

2604636785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520927362.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The square root of 2604636785 is about 51035.6423002591. The cubic root of 2604636785 is about 1375.8858045399.

The spelling of 2604636785 in words is "two billion, six hundred four million, six hundred thirty-six thousand, seven hundred eighty-five".