11658640 has 80 divisors (see below), whose sum is σ = 31426560. Its totient is φ = 3939840.

The previous prime is 11658629. The next prime is 11658671. The reversal of 11658640 is 4685611.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60945 + ... + 61135.

It is an arithmetic number, because the mean of its divisors is an integer number (392832).

Almost surely, 2^11658640 is an apocalyptic number.

11658640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11658640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15713280).

11658640 is an abundant number, since it is smaller than the sum of its proper divisors (19767920).

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

11658640 is a wasteful number, since it uses less digits than its factorization.

11658640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 11658640 is about 3414.4750694653. The cubic root of 11658640 is about 226.7510450946.

The spelling of 11658640 in words is "eleven million, six hundred fifty-eight thousand, six hundred forty".