2781447340 has 24 divisors (see below), whose sum is σ = 6675473952. Its totient is φ = 953639040.

The previous prime is 2781447337. The next prime is 2781447341. The reversal of 2781447340 is 437441872.

It is a junction number, because it is equal to n+sod(n) for n = 2781447293 and 2781447302.

It is not an unprimeable number, because it can be changed into a prime (2781447341) 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, 9933601 + ... + 9933880.

It is an arithmetic number, because the mean of its divisors is an integer number (278144748).

Almost surely, 2^2781447340 is an apocalyptic number.

2781447340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2781447340 is an abundant number, since it is smaller than the sum of its proper divisors (3894026612).

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

2781447340 is a wasteful number, since it uses less digits than its factorization.

2781447340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19867497 (or 19867495 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The square root of 2781447340 is about 52739.4287037696. The cubic root of 2781447340 is about 1406.3398421876.

The spelling of 2781447340 in words is "two billion, seven hundred eighty-one million, four hundred forty-seven thousand, three hundred forty".