11641640 has 16 divisors (see below), whose sum is σ = 26193780. Its totient is φ = 4656640.

The previous prime is 11641639. The next prime is 11641681. The reversal of 11641640 is 4614611.

It can be written as a sum of positive squares in 2 ways, for example, as 11600836 + 40804 = 3406^2 + 202^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145481 + ... + 145560.

Almost surely, 2^11641640 is an apocalyptic number.

11641640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11641640 is an abundant number, since it is smaller than the sum of its proper divisors (14552140).

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

11641640 is a wasteful number, since it uses less digits than its factorization.

11641640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291052 (or 291048 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 11641640 is about 3411.9847596377. The cubic root of 11641640 is about 226.6407794350.

The spelling of 11641640 in words is "eleven million, six hundred forty-one thousand, six hundred forty".