7478378817440 has 96 divisors (see below), whose sum is σ = 18708166515024. Its totient is φ = 2815205785600.

The previous prime is 7478378817433. The next prime is 7478378817467. The reversal of 7478378817440 is 447188738747.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6762100963216 + 716277854224 = 2600404^2 + 846332^2 .

It is a super-2 number, since 2×7478378817440² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45889382 + ... + 46052058.

Almost surely, 2^{7478378817440} is an apocalyptic number.

It is an amenable number.

7478378817440 is an abundant number, since it is smaller than the sum of its proper divisors (11229787697584).

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

7478378817440 is a wasteful number, since it uses less digits than its factorization.

7478378817440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179610 (or 179602 counting only the distinct ones).

The product of its (nonzero) digits is 236027904, while the sum is 68.

The spelling of 7478378817440 in words is "seven trillion, four hundred seventy-eight billion, three hundred seventy-eight million, eight hundred seventeen thousand, four hundred forty".