7778283821 has 64 divisors (see below), whose sum is σ = 10499328000. Its totient is φ = 5580472320.

The previous prime is 7778283817. The next prime is 7778283827. The reversal of 7778283821 is 1283828777.

It is a cyclic number.

It is not a de Polignac number, because 7778283821 - 2² = 7778283817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7778283827) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8372285 + ... + 8373213.

It is an arithmetic number, because the mean of its divisors is an integer number (164052000).

Almost surely, 2^7778283821 is an apocalyptic number.

It is an amenable number.

7778283821 is a deficient number, since it is larger than the sum of its proper divisors (2721044179).

7778283821 is a wasteful number, since it uses less digits than its factorization.

7778283821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its digits is 2107392, while the sum is 53.

The square root of 7778283821 is about 88194.5793175522. The cubic root of 7778283821 is about 1981.3502863904.

The spelling of 7778283821 in words is "seven billion, seven hundred seventy-eight million, two hundred eighty-three thousand, eight hundred twenty-one".