1025000000 has 126 divisors (see below), whose sum is σ = 2604490854. Its totient is φ = 400000000.

The previous prime is 1024999999. The next prime is 1025000051. The reversal of 1025000000 is 5201.

It can be written as a sum of positive squares in 9 ways, for example, as 106667584 + 918332416 = 10328^2 + 30304^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24999980 + ... + 25000020.

Almost surely, 2^1025000000 is an apocalyptic number.

1025000000 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 1025000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1302245427).

1025000000 is an abundant number, since it is smaller than the sum of its proper divisors (1579490854).

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

1025000000 is an frugal number, since it uses more digits than its factorization.

1025000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 1025000000 is about 32015.6211871642. The cubic root of 1025000000 is about 1008.2648376091.

Adding to 1025000000 its reverse (5201), we get a palindrome (1025005201).

The spelling of 1025000000 in words is "one billion, twenty-five million", and thus it is an aban number and an uban number.