820782147842 has 8 divisors (see below), whose sum is σ = 1232577070716. Its totient is φ = 409923124272.

The previous prime is 820782147833. The next prime is 820782147853. The reversal of 820782147842 is 248741287028.

820782147842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 690728872201 + 130053275641 = 831101^2 + 360629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×820782147842² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233972633 + ... + 233976140.

Almost surely, 2^820782147842 is an apocalyptic number.

820782147842 is a deficient number, since it is larger than the sum of its proper divisors (411794922874).

820782147842 is a wasteful number, since it uses less digits than its factorization.

820782147842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467949652.

The product of its (nonzero) digits is 3211264, while the sum is 53.

The spelling of 820782147842 in words is "eight hundred twenty billion, seven hundred eighty-two million, one hundred forty-seven thousand, eight hundred forty-two".