10691780 has 48 divisors (see below), whose sum is σ = 25570944. Its totient is φ = 3717120.

The previous prime is 10691777. The next prime is 10691789. The reversal of 10691780 is 8719601.

It is a super-2 number, since 2×10691780² = 228628319136800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10691789) 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, 4004 + ... + 6116.

It is an arithmetic number, because the mean of its divisors is an integer number (532728).

Almost surely, 2^10691780 is an apocalyptic number.

10691780 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 10691780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12785472).

10691780 is an abundant number, since it is smaller than the sum of its proper divisors (14879164).

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

10691780 is a wasteful number, since it uses less digits than its factorization.

10691780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156 (or 2154 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 10691780 is about 3269.8287416928. The cubic root of 10691780 is about 220.3011028593.

The spelling of 10691780 in words is "ten million, six hundred ninety-one thousand, seven hundred eighty".