2645678660 has 24 divisors (see below), whose sum is σ = 5574899736. Its totient is φ = 1054657280.

The previous prime is 2645678621. The next prime is 2645678681. The reversal of 2645678660 is 668765462.

It is a happy number.

2645678660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 829555204 + 1816123456 = 28802^2 + 42616^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2645678599 and 2645678608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219881 + ... + 231600.

It is an arithmetic number, because the mean of its divisors is an integer number (232287489).

Almost surely, 2^2645678660 is an apocalyptic number.

2645678660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2645678660 is an abundant number, since it is smaller than the sum of its proper divisors (2929221076).

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

2645678660 is a wasteful number, since it uses less digits than its factorization.

2645678660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451783 (or 451781 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The square root of 2645678660 is about 51436.1610153791. The cubic root of 2645678660 is about 1383.0748945119.

The spelling of 2645678660 in words is "two billion, six hundred forty-five million, six hundred seventy-eight thousand, six hundred sixty".