2685661380 has 96 divisors (see below), whose sum is σ = 8421396480. Its totient is φ = 710519040.

The previous prime is 2685661369. The next prime is 2685661397. The reversal of 2685661380 is 831665862.

2685661380 is a `hidden beast` number, since 2 + 6 + 8 + 566 + 1 + 3 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 49000 + ... + 88160.

It is an arithmetic number, because the mean of its divisors is an integer number (87722880).

Almost surely, 2^2685661380 is an apocalyptic number.

2685661380 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 2685661380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4210698240).

2685661380 is an abundant number, since it is smaller than the sum of its proper divisors (5735735100).

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

2685661380 is a wasteful number, since it uses less digits than its factorization.

2685661380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39306 (or 39298 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 2685661380 is about 51823.3671233354. The cubic root of 2685661380 is about 1390.0073115224.

The spelling of 2685661380 in words is "two billion, six hundred eighty-five million, six hundred sixty-one thousand, three hundred eighty".