10491640 has 32 divisors (see below), whose sum is σ = 24370560. Its totient is φ = 4060800.

The previous prime is 10491623. The next prime is 10491643. The reversal of 10491640 is 4619401.

It is a super-2 number, since 2×10491640² = 220149019779200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10491643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2991 + ... + 5470.

It is an arithmetic number, because the mean of its divisors is an integer number (761580).

Almost surely, 2^10491640 is an apocalyptic number.

10491640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10491640 is an abundant number, since it is smaller than the sum of its proper divisors (13878920).

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

10491640 is a wasteful number, since it uses less digits than its factorization.

10491640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8503 (or 8499 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 10491640 is about 3239.0801163293. The cubic root of 10491640 is about 218.9178260401.

The spelling of 10491640 in words is "ten million, four hundred ninety-one thousand, six hundred forty".