11947780920 has 32 divisors (see below), whose sum is σ = 35843343120. Its totient is φ = 3186074880.

The previous prime is 11947780913. The next prime is 11947780973. The reversal of 11947780920 is 2908774911.

It is a self number, because there is not a number n which added to its sum of digits gives 11947780920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49782301 + ... + 49782540.

Almost surely, 2^11947780920 is an apocalyptic number.

11947780920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11947780920 is an abundant number, since it is smaller than the sum of its proper divisors (23895562200).

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

11947780920 is a wasteful number, since it uses less digits than its factorization.

11947780920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99564855 (or 99564851 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 48.

The spelling of 11947780920 in words is "eleven billion, nine hundred forty-seven million, seven hundred eighty thousand, nine hundred twenty".