7421777798436 has 81 divisors (see below), whose sum is σ = 18828987027123. Its totient is φ = 2464941211200.

The previous prime is 7421777798327. The next prime is 7421777798443. The reversal of 7421777798436 is 6348977771247.

The square root of 7421777798436 is 2724294.

It is a perfect power (a square), and thus also a powerful number.

7421777798436 is a `hidden beast` number, since 7 + 42 + 17 + 77 + 79 + 8 + 436 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1722672000036 + 5699105798400 = 1312506^2 + 2387280^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5704670986 + ... + 5704672286.

Almost surely, 2^{7421777798436} is an apocalyptic number.

7421777798436 is the 2724294-th square number.

It is an amenable number.

7421777798436 is an abundant number, since it is smaller than the sum of its proper divisors (11407209228687).

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

7421777798436 is an equidigital number, since it uses as much as digits as its factorization.

7421777798436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310 (or 1655 counting only the distinct ones).

The product of its digits is 697019904, while the sum is 72.

The spelling of 7421777798436 in words is "seven trillion, four hundred twenty-one billion, seven hundred seventy-seven million, seven hundred ninety-eight thousand, four hundred thirty-six".