1025126720 has 56 divisors (see below), whose sum is σ = 2450363400. Its totient is φ = 408492032.

The previous prime is 1025126719. The next prime is 1025126747. The reversal of 1025126720 is 276215201.

It can be written as a sum of positive squares in 4 ways, for example, as 614656 + 1024512064 = 784^2 + 32008^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1025126720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80126 + ... + 92034.

Almost surely, 2^1025126720 is an apocalyptic number.

1025126720 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 1025126720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1225181700).

1025126720 is an abundant number, since it is smaller than the sum of its proper divisors (1425236680).

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

1025126720 is a wasteful number, since it uses less digits than its factorization.

1025126720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12195 (or 12185 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1025126720 is about 32017.6001599120. The cubic root of 1025126720 is about 1008.3063862449.

The spelling of 1025126720 in words is "one billion, twenty-five million, one hundred twenty-six thousand, seven hundred twenty".