2563981890 has 32 divisors (see below), whose sum is σ = 6254438976. Its totient is φ = 672519360.

The previous prime is 2563981877. The next prime is 2563981919. The reversal of 2563981890 is 981893652.

It is a happy 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, 698712 + ... + 702371.

It is an arithmetic number, because the mean of its divisors is an integer number (195451218).

Almost surely, 2^2563981890 is an apocalyptic number.

2563981890 is an abundant number, since it is smaller than the sum of its proper divisors (3690457086).

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

2563981890 is a wasteful number, since it uses less digits than its factorization.

2563981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401154.

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 2563981890 is about 50635.7767788744. The cubic root of 2563981890 is about 1368.6896541023.

The spelling of 2563981890 in words is "two billion, five hundred sixty-three million, nine hundred eighty-one thousand, eight hundred ninety".