1026561780 has 72 divisors (see below), whose sum is σ = 3180183552. Its totient is φ = 267923136.

The previous prime is 1026561751. The next prime is 1026561803. The reversal of 1026561780 is 871656201.

1026561780 is a `hidden beast` number, since 1 + 0 + 26 + 561 + 78 + 0 = 666.

1026561780 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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52212 + ... + 69131.

It is an arithmetic number, because the mean of its divisors is an integer number (44169216).

Almost surely, 2^1026561780 is an apocalyptic number.

1026561780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1026561780 is an abundant number, since it is smaller than the sum of its proper divisors (2153621772).

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

1026561780 is a wasteful number, since it uses less digits than its factorization.

1026561780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121405 (or 121400 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1026561780 is about 32040.0028089886. The cubic root of 1026561780 is about 1008.7766713511.

The spelling of 1026561780 in words is "one billion, twenty-six million, five hundred sixty-one thousand, seven hundred eighty".