2789256720 has 80 divisors (see below), whose sum is σ = 8788491072. Its totient is φ = 731604480.

The previous prime is 2789256661. The next prime is 2789256721. The reversal of 2789256720 is 276529872.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 2789256720.

It is not an unprimeable number, because it can be changed into a prime (2789256721) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 80622 + ... + 109901.

Almost surely, 2^2789256720 is an apocalyptic number.

2789256720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2789256720 is an abundant number, since it is smaller than the sum of its proper divisors (5999234352).

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

2789256720 is a wasteful number, since it uses less digits than its factorization.

2789256720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190600 (or 190594 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The square root of 2789256720 is about 52813.4142051051. The cubic root of 2789256720 is about 1407.6547906493.

The spelling of 2789256720 in words is "two billion, seven hundred eighty-nine million, two hundred fifty-six thousand, seven hundred twenty".