2638877652 has 18 divisors (see below), whose sum is σ = 6670496378. Its totient is φ = 879625872.

The previous prime is 2638877639. The next prime is 2638877663. The reversal of 2638877652 is 2567788362.

It can be written as a sum of positive squares in only one way, i.e., 2600388036 + 38489616 = 50994^2 + 6204^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36651043 + ... + 36651114.

Almost surely, 2^2638877652 is an apocalyptic number.

It is an amenable number.

2638877652 is an abundant number, since it is smaller than the sum of its proper divisors (4031618726).

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

2638877652 is a wasteful number, since it uses less digits than its factorization.

2638877652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73302167 (or 73302162 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The square root of 2638877652 is about 51370.0073194466. The cubic root of 2638877652 is about 1381.8887621880. Note that the first 3 decimals are identical.

The spelling of 2638877652 in words is "two billion, six hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred fifty-two".