7814828781 has 64 divisors (see below), whose sum is σ = 12242534400. Its totient is φ = 4920350400.

The previous prime is 7814828761. The next prime is 7814828789. The reversal of 7814828781 is 1878284187.

It is a happy number.

7814828781 is a `hidden beast` number, since 7 + 8 + 1 + 482 + 87 + 81 = 666.

It is not a de Polignac number, because 7814828781 - 2⁶ = 7814828717 is a prime.

It is a super-2 number, since 2×7814828781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7814828789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6358075 + ... + 6359303.

It is an arithmetic number, because the mean of its divisors is an integer number (191289600).

Almost surely, 2^7814828781 is an apocalyptic number.

7814828781 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7814828781 is a deficient number, since it is larger than the sum of its proper divisors (4427705619).

7814828781 is a wasteful number, since it uses less digits than its factorization.

7814828781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1441 counting only the distinct ones).

The product of its digits is 1605632, while the sum is 54.

The square root of 7814828781 is about 88401.5202414529. The cubic root of 7814828781 is about 1984.4484532088.

It can be divided in two parts, 78148 and 28781, that added together give a square (106929 = 327²).

The spelling of 7814828781 in words is "seven billion, eight hundred fourteen million, eight hundred twenty-eight thousand, seven hundred eighty-one".