2645861328 has 80 divisors (see below), whose sum is σ = 8285035200. Its totient is φ = 801774720.

The previous prime is 2645861299. The next prime is 2645861333. The reversal of 2645861328 is 8231685462.

2645861328 is a `hidden beast` number, since 2 + 6 + 4 + 5 + 8 + 613 + 28 = 666.

2645861328 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273643 + ... + 283146.

It is an arithmetic number, because the mean of its divisors is an integer number (103562940).

Almost surely, 2^2645861328 is an apocalyptic number.

It is an amenable number.

2645861328 is an abundant number, since it is smaller than the sum of its proper divisors (5639173872).

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

2645861328 is a wasteful number, since it uses less digits than its factorization.

2645861328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556817 (or 556805 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 2645861328 is about 51437.9366615730. The cubic root of 2645861328 is about 1383.1067247456.

The spelling of 2645861328 in words is "two billion, six hundred forty-five million, eight hundred sixty-one thousand, three hundred twenty-eight".