1066781920 has 48 divisors (see below), whose sum is σ = 2601583488. Its totient is φ = 412945920.

The previous prime is 1066781899. The next prime is 1066781927. The reversal of 1066781920 is 291876601.

It is a super-2 number, since 2×1066781920² = 2276047329677772800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066781927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102579 + ... + 112498.

It is an arithmetic number, because the mean of its divisors is an integer number (54199656).

Almost surely, 2^1066781920 is an apocalyptic number.

1066781920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066781920 is an abundant number, since it is smaller than the sum of its proper divisors (1534801568).

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

1066781920 is a wasteful number, since it uses less digits than its factorization.

1066781920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215123 (or 215115 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1066781920 is about 32661.6276385608. The cubic root of 1066781920 is about 1021.7827084146.

The spelling of 1066781920 in words is "one billion, sixty-six million, seven hundred eighty-one thousand, nine hundred twenty".