1025081864 has 8 divisors (see below), whose sum is σ = 1922028510. Its totient is φ = 512540928.

The previous prime is 1025081831. The next prime is 1025081887. The reversal of 1025081864 is 4681805201.

It can be written as a sum of positive squares in only one way, i.e., 550277764 + 474804100 = 23458^2 + 21790^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64067609 + ... + 64067624.

Almost surely, 2^1025081864 is an apocalyptic number.

It is an amenable number.

1025081864 is a deficient number, since it is larger than the sum of its proper divisors (896946646).

1025081864 is a wasteful number, since it uses less digits than its factorization.

1025081864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128135239 (or 128135235 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 1025081864 is about 32016.8996625220. The cubic root of 1025081864 is about 1008.2916793636.

The spelling of 1025081864 in words is "one billion, twenty-five million, eighty-one thousand, eight hundred sixty-four".