1025235640 has 128 divisors (see below), whose sum is σ = 2730309120. Its totient is φ = 341568000.

The previous prime is 1025235593. The next prime is 1025235661. The reversal of 1025235640 is 465325201.

It is a super-2 number, since 2×1025235640² = 2102216235052419200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1025235599 and 1025235608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 863127 + ... + 864313.

It is an arithmetic number, because the mean of its divisors is an integer number (21330540).

Almost surely, 2^1025235640 is an apocalyptic number.

1025235640 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 1025235640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365154560).

1025235640 is an abundant number, since it is smaller than the sum of its proper divisors (1705073480).

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

1025235640 is a wasteful number, since it uses less digits than its factorization.

1025235640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1369 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1025235640 is about 32019.3010542079. The cubic root of 1025235640 is about 1008.3420959252.

The spelling of 1025235640 in words is "one billion, twenty-five million, two hundred thirty-five thousand, six hundred forty".