1025689866 has 64 divisors (see below), whose sum is σ = 2263282560. Its totient is φ = 308541440.

The previous prime is 1025689859. The next prime is 1025689871. The reversal of 1025689866 is 6689865201.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244660 + ... + 248816.

It is an arithmetic number, because the mean of its divisors is an integer number (35363790).

Almost surely, 2^1025689866 is an apocalyptic number.

1025689866 is an abundant number, since it is smaller than the sum of its proper divisors (1237592694).

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

1025689866 is a wasteful number, since it uses less digits than its factorization.

1025689866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 1025689866 is about 32026.3932718001. The cubic root of 1025689866 is about 1008.4909877360.

The spelling of 1025689866 in words is "one billion, twenty-five million, six hundred eighty-nine thousand, eight hundred sixty-six".