2061487638 has 64 divisors (see below), whose sum is σ = 5251384320. Its totient is φ = 587212416.

The previous prime is 2061487621. The next prime is 2061487663. The reversal of 2061487638 is 8367841602.

2061487638 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 4 + 8 + 7 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2061487593 and 2061487602.

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, 119295 + ... + 135477.

It is an arithmetic number, because the mean of its divisors is an integer number (82052880).

Almost surely, 2^2061487638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2061487638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2625692160).

2061487638 is an abundant number, since it is smaller than the sum of its proper divisors (3189896682).

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

2061487638 is a wasteful number, since it uses less digits than its factorization.

2061487638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16538 (or 16532 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 2061487638 is about 45403.6082046350. The cubic root of 2061487638 is about 1272.7025422186.

The spelling of 2061487638 in words is "two billion, sixty-one million, four hundred eighty-seven thousand, six hundred thirty-eight".