782660020 has 24 divisors (see below), whose sum is σ = 1660534344. Its totient is φ = 309835776.

The previous prime is 782659981. The next prime is 782660041. The reversal of 782660020 is 20066287.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9597604 + 773062416 = 3098^2 + 27804^2 .

It is a super-2 number, since 2×782660020² = 1225113413812800800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199777 + ... + 203656.

It is an arithmetic number, because the mean of its divisors is an integer number (69188931).

Almost surely, 2^782660020 is an apocalyptic number.

It is an amenable number.

782660020 is an abundant number, since it is smaller than the sum of its proper divisors (877874324).

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

782660020 is a wasteful number, since it uses less digits than its factorization.

782660020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403539 (or 403537 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 782660020 is about 27976.0615526918. The cubic root of 782660020 is about 921.5616278476.

The spelling of 782660020 in words is "seven hundred eighty-two million, six hundred sixty thousand, twenty".