10639980 has 72 divisors (see below), whose sum is σ = 34764912. Its totient is φ = 2618496.

The previous prime is 10639949. The next prime is 10639987. The reversal of 10639980 is 8993601.

10639980 is a `hidden beast` number, since 10 + 639 + 9 + 8 + 0 = 666.

It is a super-2 number, since 2×10639980² = 226418348800800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (10639987) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 67 + ... + 4613.

It is an arithmetic number, because the mean of its divisors is an integer number (482846).

Almost surely, 2^10639980 is an apocalyptic number.

10639980 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 10639980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17382456).

10639980 is an abundant number, since it is smaller than the sum of its proper divisors (24124932).

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

10639980 is a wasteful number, since it uses less digits than its factorization.

10639980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4575 (or 4570 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 10639980 is about 3261.8982203619. The cubic root of 10639980 is about 219.9447519671.

The spelling of 10639980 in words is "ten million, six hundred thirty-nine thousand, nine hundred eighty".