2758991000 has 64 divisors (see below), whose sum is σ = 6505630560. Its totient is φ = 1095120000.

The previous prime is 2758990973. The next prime is 2758991017. The reversal of 2758991000 is 1998572.

It is a super-2 number, since 2×2758991000² = 15224062676162000000, which contains 22 as substring.

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, 120470 + ... + 141530.

Almost surely, 2^2758991000 is an apocalyptic number.

2758991000 is a gapful number since it is divisible by the number (20) 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 2758991000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3252815280).

2758991000 is an abundant number, since it is smaller than the sum of its proper divisors (3746639560).

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

2758991000 is a wasteful number, since it uses less digits than its factorization.

2758991000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21213 (or 21199 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 2758991000 is about 52526.0982750480. The cubic root of 2758991000 is about 1402.5448610517.

The spelling of 2758991000 in words is "two billion, seven hundred fifty-eight million, nine hundred ninety-one thousand".