10640643 has 16 divisors (see below), whose sum is σ = 15353856. Its totient is φ = 6516000.

The previous prime is 10640639. The next prime is 10640647. The reversal of 10640643 is 34604601.

It is a Cunningham number, because it is equal to 3262²-1.

It is an interprime number because it is at equal distance from previous prime (10640639) and next prime (10640647).

It is not a de Polignac number, because 10640643 - 2² = 10640639 is a prime.

It is a super-2 number, since 2×10640643² = 226446566906898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10640647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9246 + ... + 10332.

It is an arithmetic number, because the mean of its divisors is an integer number (959616).

Almost surely, 2^10640643 is an apocalyptic number.

10640643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

10640643 is a deficient number, since it is larger than the sum of its proper divisors (4713213).

10640643 is a wasteful number, since it uses less digits than its factorization.

10640643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 10640643 is about 3261.9998467198. Note that the first 3 decimals coincide. The cubic root of 10640643 is about 219.9493202821.

The spelling of 10640643 in words is "ten million, six hundred forty thousand, six hundred forty-three".