2878720920 has 96 divisors (see below), whose sum is σ = 9514486800. Its totient is φ = 754642176.

The previous prime is 2878720877. The next prime is 2878720921. The reversal of 2878720920 is 290278782.

It is a happy number.

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 (2878720921) 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 23 ways as a sum of consecutive naturals, for example, 46527 + ... + 89006.

Almost surely, 2^2878720920 is an apocalyptic number.

2878720920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2878720920 is an abundant number, since it is smaller than the sum of its proper divisors (6635765880).

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

2878720920 is a wasteful number, since it uses less digits than its factorization.

2878720920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135609 (or 135602 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 2878720920 is about 53653.7130122418. The cubic root of 2878720920 is about 1422.5466632415.

The spelling of 2878720920 in words is "two billion, eight hundred seventy-eight million, seven hundred twenty thousand, nine hundred twenty".