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2978386889 = 20031486963
BaseRepresentation
bin1011000110000110…
…1001001111001001
321200120100201201112
42301201221033021
522044431340024
61211313100105
7133543604462
oct26141511711
97616321645
102978386889
111299249175
126b1557635
13386087b0a
142037bbd69
1512672500e
hexb18693c9

2978386889 has 4 divisors (see below), whose sum is σ = 2979875856. Its totient is φ = 2976897924.

The previous prime is 2978386883. The next prime is 2978386919. The reversal of 2978386889 is 9886838792.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2978386889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2978386883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741479 + ... + 745484.

It is an arithmetic number, because the mean of its divisors is an integer number (744968964).

Almost surely, 22978386889 is an apocalyptic number.

It is an amenable number.

2978386889 is a deficient number, since it is larger than the sum of its proper divisors (1488967).

2978386889 is a wasteful number, since it uses less digits than its factorization.

2978386889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488966.

The product of its digits is 83607552, while the sum is 68.

The square root of 2978386889 is about 54574.5993022395. The cubic root of 2978386889 is about 1438.7777194053. Note that the first 4 decimals are identical.

The spelling of 2978386889 in words is "two billion, nine hundred seventy-eight million, three hundred eighty-six thousand, eight hundred eighty-nine".

Divisors: 1 2003 1486963 2978386889