11787720 has 64 divisors (see below), whose sum is σ = 40417920. Its totient is φ = 2694144.

The previous prime is 11787691. The next prime is 11787739. The reversal of 11787720 is 2778711.

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, 6177 + ... + 7856.

It is an arithmetic number, because the mean of its divisors is an integer number (631530).

Almost surely, 2^11787720 is an apocalyptic number.

11787720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11787720 is an abundant number, since it is smaller than the sum of its proper divisors (28630200).

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

11787720 is a wasteful number, since it uses less digits than its factorization.

11787720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14054 (or 14050 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 33.

The square root of 11787720 is about 3433.3249190835. The cubic root of 11787720 is about 227.5848091805.

Subtracting from 11787720 its reverse (2778711), we obtain a palindrome (9009009).

The spelling of 11787720 in words is "eleven million, seven hundred eighty-seven thousand, seven hundred twenty".