1025720920 has 64 divisors (see below), whose sum is σ = 2691432000. Its totient is φ = 351671040.

The previous prime is 1025720881. The next prime is 1025720921. The reversal of 1025720920 is 290275201.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025720921) 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, 23661 + ... + 51100.

It is an arithmetic number, because the mean of its divisors is an integer number (42053625).

Almost surely, 2^1025720920 is an apocalyptic number.

1025720920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025720920 is an abundant number, since it is smaller than the sum of its proper divisors (1665711080).

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

1025720920 is an equidigital number, since it uses as much as digits as its factorization.

1025720920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74793 (or 74775 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1025720920 is about 32026.8780870069. The cubic root of 1025720920 is about 1008.5011653944.

The spelling of 1025720920 in words is "one billion, twenty-five million, seven hundred twenty thousand, nine hundred twenty".