1026781380 has 192 divisors, whose sum is σ = 3341721600. Its totient is φ = 261429120.

The previous prime is 1026781361. The next prime is 1026781381. The reversal of 1026781380 is 831876201.

1026781380 is a `hidden beast` number, since 10 + 267 + 8 + 1 + 380 = 666.

1026781380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1026781381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1389051 + ... + 1389789.

It is an arithmetic number, because the mean of its divisors is an integer number (17404800).

Almost surely, 2^1026781380 is an apocalyptic number.

1026781380 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 1026781380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1670860800).

1026781380 is an abundant number, since it is smaller than the sum of its proper divisors (2314940220).

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

1026781380 is a wasteful number, since it uses less digits than its factorization.

1026781380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1026781380 is about 32043.4295917275. The cubic root of 1026781380 is about 1008.8485980378.

The spelling of 1026781380 in words is "one billion, twenty-six million, seven hundred eighty-one thousand, three hundred eighty".