2858661720 has 384 divisors, whose sum is σ = 10598515200. Its totient is φ = 689762304.

The previous prime is 2858661713. The next prime is 2858661721. The reversal of 2858661720 is 271668582.

2858661720 is a `hidden beast` number, since 2 + 8 + 5 + 8 + 6 + 617 + 20 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2858661721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4247304 + ... + 4247976.

It is an arithmetic number, because the mean of its divisors is an integer number (27600300).

Almost surely, 2^2858661720 is an apocalyptic number.

2858661720 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 2858661720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5299257600).

2858661720 is an abundant number, since it is smaller than the sum of its proper divisors (7739853480).

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

2858661720 is a wasteful number, since it uses less digits than its factorization.

2858661720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 2858661720 is about 53466.4541558536. The cubic root of 2858661720 is about 1419.2348122339.

The spelling of 2858661720 in words is "two billion, eight hundred fifty-eight million, six hundred sixty-one thousand, seven hundred twenty".