1025111808 has 144 divisors (see below), whose sum is σ = 3464661760. Its totient is φ = 292875264.

The previous prime is 1025111803. The next prime is 1025111809. The reversal of 1025111808 is 8081115201.

1025111808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025111803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37791 + ... + 58977.

Almost surely, 2^1025111808 is an apocalyptic number.

1025111808 is a gapful number since it is divisible by the number (18) 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 1025111808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732330880).

1025111808 is an abundant number, since it is smaller than the sum of its proper divisors (2439549952).

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

1025111808 is an equidigital number, since it uses as much as digits as its factorization.

1025111808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21219 (or 21199 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 1025111808 is about 32017.3672871459. The cubic root of 1025111808 is about 1008.3014971135.

The spelling of 1025111808 in words is "one billion, twenty-five million, one hundred eleven thousand, eight hundred eight".