7856824420 has 24 divisors (see below), whose sum is σ = 17068275000. Its totient is φ = 3034359552.

The previous prime is 7856824379. The next prime is 7856824427. The reversal of 7856824420 is 244286587.

It can be written as a sum of positive squares in 4 ways, for example, as 1435045924 + 6421778496 = 37882^2 + 80136^2 .

It is a super-3 number, since 3×7856824420³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (7856824427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6772545 + ... + 6773704.

It is an arithmetic number, because the mean of its divisors is an integer number (711178125).

Almost surely, 2^7856824420 is an apocalyptic number.

It is an amenable number.

7856824420 is an abundant number, since it is smaller than the sum of its proper divisors (9211450580).

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

7856824420 is a wasteful number, since it uses less digits than its factorization.

7856824420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13546287 (or 13546285 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 46.

The square root of 7856824420 is about 88638.7297968557. The cubic root of 7856824420 is about 1987.9968074661.

The spelling of 7856824420 in words is "seven billion, eight hundred fifty-six million, eight hundred twenty-four thousand, four hundred twenty".