1223708785380 has 36 divisors (see below), whose sum is σ = 3711916649532. Its totient is φ = 326322342720.

The previous prime is 1223708785373. The next prime is 1223708785391. The reversal of 1223708785380 is 835878073221.

1223708785380 is a `hidden beast` number, since 1 + 2 + 2 + 37 + 0 + 8 + 78 + 538 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 599141017764 + 624567767616 = 774042^2 + 790296^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3399190891 + ... + 3399191250.

Almost surely, 2^{1223708785380} is an apocalyptic number.

1223708785380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223708785380 is an abundant number, since it is smaller than the sum of its proper divisors (2488207864152).

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

1223708785380 is a wasteful number, since it uses less digits than its factorization.

1223708785380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6798382156 (or 6798382151 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 1223708785380 in words is "one trillion, two hundred twenty-three billion, seven hundred eight million, seven hundred eighty-five thousand, three hundred eighty".