2780399000 has 32 divisors (see below), whose sum is σ = 6506136000. Its totient is φ = 1112159200.

The previous prime is 2780398997. The next prime is 2780399009. The reversal of 2780399000 is 9930872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780399009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389200 + ... + 1391199.

It is an arithmetic number, because the mean of its divisors is an integer number (203316750).

Almost surely, 2^2780399000 is an apocalyptic number.

2780399000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780399000 is an abundant number, since it is smaller than the sum of its proper divisors (3725737000).

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

2780399000 is a wasteful number, since it uses less digits than its factorization.

2780399000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780420 (or 2780406 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2780399000 is about 52729.4889032693. The cubic root of 2780399000 is about 1406.1631347167.

The spelling of 2780399000 in words is "two billion, seven hundred eighty million, three hundred ninety-nine thousand".