7820281218404 has 6 divisors (see below), whose sum is σ = 13685492132214. Its totient is φ = 3910140609200.

The previous prime is 7820281218391. The next prime is 7820281218457. The reversal of 7820281218404 is 4048121820287.

It can be written as a sum of positive squares in only one way, i.e., 6811056040000 + 1009225178404 = 2609800^2 + 1004602^2 .

It is a super-2 number, since 2×7820281218404² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977535152297 + ... + 977535152304.

It is an arithmetic number, because the mean of its divisors is an integer number (2280915355369).

Almost surely, 2^{7820281218404} is an apocalyptic number.

It is an amenable number.

7820281218404 is a deficient number, since it is larger than the sum of its proper divisors (5865210913810).

7820281218404 is a wasteful number, since it uses less digits than its factorization.

7820281218404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955070304605 (or 1955070304603 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 47.

The spelling of 7820281218404 in words is "seven trillion, eight hundred twenty billion, two hundred eighty-one million, two hundred eighteen thousand, four hundred four".