7820420707388 has 12 divisors (see below), whose sum is σ = 13685810103000. Its totient is φ = 3910189249392.

The previous prime is 7820420707373. The next prime is 7820420707447. The reversal of 7820420707388 is 8837070240287.

It is a super-2 number, since 2×7820420707388² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 4427138 + ... + 5936361.

It is an arithmetic number, because the mean of its divisors is an integer number (1140484175250).

Almost surely, 2^{7820420707388} is an apocalyptic number.

It is an amenable number.

7820420707388 is a deficient number, since it is larger than the sum of its proper divisors (5865389395612).

7820420707388 is a wasteful number, since it uses less digits than its factorization.

7820420707388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10552156 (or 10552154 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 56.

The spelling of 7820420707388 in words is "seven trillion, eight hundred twenty billion, four hundred twenty million, seven hundred seven thousand, three hundred eighty-eight".