1025639260 has 48 divisors (see below), whose sum is σ = 2216077920. Its totient is φ = 398442240.

The previous prime is 1025639243. The next prime is 1025639267. The reversal of 1025639260 is 629365201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025639267) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 599286 + ... + 600994.

It is an arithmetic number, because the mean of its divisors is an integer number (46168290).

Almost surely, 2^1025639260 is an apocalyptic number.

1025639260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025639260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108038960).

1025639260 is an abundant number, since it is smaller than the sum of its proper divisors (1190438660).

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

1025639260 is a wasteful number, since it uses less digits than its factorization.

1025639260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1025639260 is about 32025.6031949439. The cubic root of 1025639260 is about 1008.4744016522.

The spelling of 1025639260 in words is "one billion, twenty-five million, six hundred thirty-nine thousand, two hundred sixty".