10643840 has 32 divisors (see below), whose sum is σ = 25446960. Its totient is φ = 4257280.

The previous prime is 10643813. The next prime is 10643849. The reversal of 10643840 is 4834601.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×10643840² = 226582659891200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10643849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7676 + ... + 8955.

Almost surely, 2^10643840 is an apocalyptic number.

10643840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10643840 is an abundant number, since it is smaller than the sum of its proper divisors (14803120).

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

10643840 is an equidigital number, since it uses as much as digits as its factorization.

10643840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16650 (or 16638 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 10643840 is about 3262.4898467275. The cubic root of 10643840 is about 219.9713461304.

The spelling of 10643840 in words is "ten million, six hundred forty-three thousand, eight hundred forty".