782070644477 has 12 divisors (see below), whose sum is σ = 819020196540. Its totient is φ = 746724261888.

The previous prime is 782070644471. The next prime is 782070644483. The reversal of 782070644477 is 774446070287.

It is an interprime number because it is at equal distance from previous prime (782070644471) and next prime (782070644483).

It can be written as a sum of positive squares in 2 ways, for example, as 93321696196 + 688748948281 = 305486^2 + 829909^2 .

It is not a de Polignac number, because 782070644477 - 2⁴ = 782070644461 is a prime.

It is a super-2 number, since 2×782070644477² (a number of 25 digits) 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 (782070644471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1032452 + ... + 1621757.

It is an arithmetic number, because the mean of its divisors is an integer number (68251683045).

Almost surely, 2^782070644477 is an apocalyptic number.

It is an amenable number.

782070644477 is a deficient number, since it is larger than the sum of its proper divisors (36949552063).

782070644477 is a wasteful number, since it uses less digits than its factorization.

782070644477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654812 (or 2654789 counting only the distinct ones).

The product of its (nonzero) digits is 14751744, while the sum is 56.

The spelling of 782070644477 in words is "seven hundred eighty-two billion, seventy million, six hundred forty-four thousand, four hundred seventy-seven".