1090947780 has 144 divisors (see below), whose sum is σ = 3592802304. Its totient is φ = 266353920.

The previous prime is 1090947761. The next prime is 1090947791. The reversal of 1090947780 is 877490901.

1090947780 is a `hidden beast` number, since 10 + 90 + 9 + 477 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 295345 + ... + 299015.

It is an arithmetic number, because the mean of its divisors is an integer number (24950016).

Almost surely, 2^1090947780 is an apocalyptic number.

1090947780 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 1090947780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796401152).

1090947780 is an abundant number, since it is smaller than the sum of its proper divisors (2501854524).

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

1090947780 is a wasteful number, since it uses less digits than its factorization.

1090947780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826 (or 3821 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 1090947780 is about 33029.4986337970. The cubic root of 1090947780 is about 1029.4406678169.

The spelling of 1090947780 in words is "one billion, ninety million, nine hundred forty-seven thousand, seven hundred eighty".