2685641980 has 96 divisors (see below), whose sum is σ = 6964272000. Its totient is φ = 866589696.

The previous prime is 2685641957. The next prime is 2685642049. The reversal of 2685641980 is 891465862.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105106 + ... + 128134.

It is an arithmetic number, because the mean of its divisors is an integer number (72544500).

Almost surely, 2^2685641980 is an apocalyptic number.

2685641980 is a gapful number since it is divisible by the number (20) 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 2685641980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3482136000).

2685641980 is an abundant number, since it is smaller than the sum of its proper divisors (4278630020).

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

2685641980 is a wasteful number, since it uses less digits than its factorization.

2685641980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23076 (or 23060 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The square root of 2685641980 is about 51823.1799487449. The cubic root of 2685641980 is about 1390.0039645868.

The spelling of 2685641980 in words is "two billion, six hundred eighty-five million, six hundred forty-one thousand, nine hundred eighty".