1089617990 has 32 divisors (see below), whose sum is σ = 2031137856. Its totient is φ = 420600960.

The previous prime is 1089617989. The next prime is 1089618001. The reversal of 1089617990 is 997169801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15479 + ... + 49181.

It is an arithmetic number, because the mean of its divisors is an integer number (63473058).

Almost surely, 2^1089617990 is an apocalyptic number.

1089617990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1089617990 is a deficient number, since it is larger than the sum of its proper divisors (941519866).

1089617990 is a wasteful number, since it uses less digits than its factorization.

1089617990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33824.

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 1089617990 is about 33009.3621568185. The cubic root of 1089617990 is about 1029.0222253940.

The spelling of 1089617990 in words is "one billion, eighty-nine million, six hundred seventeen thousand, nine hundred ninety".