2261987128 has 8 divisors (see below), whose sum is σ = 4241225880. Its totient is φ = 1130993560.

The previous prime is 2261987089. The next prime is 2261987129. The reversal of 2261987128 is 8217891622.

2261987128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2261987129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 141374188 + ... + 141374203.

It is an arithmetic number, because the mean of its divisors is an integer number (530153235).

Almost surely, 2^2261987128 is an apocalyptic number.

It is an amenable number.

2261987128 is a deficient number, since it is larger than the sum of its proper divisors (1979238752).

2261987128 is a wasteful number, since it uses less digits than its factorization.

2261987128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282748397 (or 282748393 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 2261987128 is about 47560.3524797704. The cubic root of 2261987128 is about 1312.6936258316.

The spelling of 2261987128 in words is "two billion, two hundred sixty-one million, nine hundred eighty-seven thousand, one hundred twenty-eight".