2797578640 has 40 divisors (see below), whose sum is σ = 6529727160. Its totient is φ = 1114669056.

The previous prime is 2797578613. The next prime is 2797578643. The reversal of 2797578640 is 468757972.

It can be written as a sum of positive squares in 4 ways, for example, as 960256144 + 1837322496 = 30988^2 + 42864^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2797578643) 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 7 ways as a sum of consecutive naturals, for example, 47475 + ... + 88594.

It is an arithmetic number, because the mean of its divisors is an integer number (163243179).

Almost surely, 2^2797578640 is an apocalyptic number.

2797578640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2797578640 is an abundant number, since it is smaller than the sum of its proper divisors (3732148520).

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

2797578640 is a wasteful number, since it uses less digits than its factorization.

2797578640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136339 (or 136333 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 55.

The square root of 2797578640 is about 52892.1415713147. The cubic root of 2797578640 is about 1409.0533424021.

The spelling of 2797578640 in words is "two billion, seven hundred ninety-seven million, five hundred seventy-eight thousand, six hundred forty".