11631780 has 36 divisors (see below), whose sum is σ = 35283612. Its totient is φ = 3101760.

The previous prime is 11631779. The next prime is 11631799. The reversal of 11631780 is 8713611.

11631780 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1557504 + 10074276 = 1248^2 + 3174^2 .

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, 32131 + ... + 32490.

Almost surely, 2^11631780 is an apocalyptic number.

11631780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11631780 is an abundant number, since it is smaller than the sum of its proper divisors (23651832).

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

11631780 is a wasteful number, since it uses less digits than its factorization.

11631780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64636 (or 64631 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 11631780 is about 3410.5395467580. The cubic root of 11631780 is about 226.5767761595.

The spelling of 11631780 in words is "eleven million, six hundred thirty-one thousand, seven hundred eighty".