782638847 has 4 divisors (see below), whose sum is σ = 785464536. Its totient is φ = 779813160.

The previous prime is 782638841. The next prime is 782638849. The reversal of 782638847 is 748836287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748836287 = 67 ⋅11176661.

It is a cyclic number.

It is not a de Polignac number, because 782638847 - 2²² = 778444543 is a prime.

It is a super-2 number, since 2×782638847² = 1225047129666978818, 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 (782638841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412429 + ... + 1412982.

It is an arithmetic number, because the mean of its divisors is an integer number (196366134).

Almost surely, 2^782638847 is an apocalyptic number.

782638847 is a deficient number, since it is larger than the sum of its proper divisors (2825689).

782638847 is a wasteful number, since it uses less digits than its factorization.

782638847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825688.

The product of its digits is 3612672, while the sum is 53.

The square root of 782638847 is about 27975.6831373248. The cubic root of 782638847 is about 921.5533175554.

The spelling of 782638847 in words is "seven hundred eighty-two million, six hundred thirty-eight thousand, eight hundred forty-seven".