7478778725530 has 64 divisors (see below), whose sum is σ = 16428831713280. Its totient is φ = 2395871251200.

The previous prime is 7478778725513. The next prime is 7478778725629. The reversal of 7478778725530 is 355278778747.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 7478778725530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59358481 + ... + 59484340.

It is an arithmetic number, because the mean of its divisors is an integer number (256700495520).

Almost surely, 2^{7478778725530} is an apocalyptic number.

7478778725530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

7478778725530 is an abundant number, since it is smaller than the sum of its proper divisors (8950052987750).

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

7478778725530 is a wasteful number, since it uses less digits than its factorization.

7478778725530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118842895.

The product of its (nonzero) digits is 645388800, while the sum is 70.

The spelling of 7478778725530 in words is "seven trillion, four hundred seventy-eight billion, seven hundred seventy-eight million, seven hundred twenty-five thousand, five hundred thirty".