11557640 has 32 divisors (see below), whose sum is σ = 26245080. Its totient is φ = 4580352.

The previous prime is 11557633. The next prime is 11557673. The reversal of 11557640 is 4675511.

It can be written as a sum of positive squares in 4 ways, for example, as 5317636 + 6240004 = 2306^2 + 2498^2 .

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, 3242 + ... + 5798.

Almost surely, 2^11557640 is an apocalyptic number.

11557640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11557640 is an abundant number, since it is smaller than the sum of its proper divisors (14687440).

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

11557640 is a wasteful number, since it uses less digits than its factorization.

11557640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 11557640 is about 3399.6529234615. The cubic root of 11557640 is about 226.0943558808.

The spelling of 11557640 in words is "eleven million, five hundred fifty-seven thousand, six hundred forty".