1080649890 has 96 divisors (see below), whose sum is σ = 3041660160. Its totient is φ = 272981664.

The previous prime is 1080649873. The next prime is 1080649903. The reversal of 1080649890 is 989460801.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91927 + ... + 103013.

It is an arithmetic number, because the mean of its divisors is an integer number (31683960).

Almost surely, 2^1080649890 is an apocalyptic number.

1080649890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1080649890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520830080).

1080649890 is an abundant number, since it is smaller than the sum of its proper divisors (1961010270).

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

1080649890 is a wasteful number, since it uses less digits than its factorization.

1080649890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11141 (or 11116 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1080649890 is about 32873.2397247366. The cubic root of 1080649890 is about 1026.1913223458.

The spelling of 1080649890 in words is "one billion, eighty million, six hundred forty-nine thousand, eight hundred ninety".