1223878891640 has 32 divisors (see below), whose sum is σ = 2754526230000. Its totient is φ = 489409561344.

The previous prime is 1223878891619. The next prime is 1223878891649. The reversal of 1223878891640 is 461988783221.

It is a self number, because there is not a number n which added to its sum of digits gives 1223878891640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223878891649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4297670 + ... + 4573589.

Almost surely, 2^{1223878891640} is an apocalyptic number.

1223878891640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223878891640 is an abundant number, since it is smaller than the sum of its proper divisors (1530647338360).

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

1223878891640 is a wasteful number, since it uses less digits than its factorization.

1223878891640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8874719 (or 8874715 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 59.

The spelling of 1223878891640 in words is "one trillion, two hundred twenty-three billion, eight hundred seventy-eight million, eight hundred ninety-one thousand, six hundred forty".