2780670 has 32 divisors (see below), whose sum is σ = 6791040. Its totient is φ = 728480.

The previous prime is 2780647. The next prime is 2780671. The reversal of 2780670 is 760872.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985 + ... + 2555.

It is an arithmetic number, because the mean of its divisors is an integer number (212220).

2^2780670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2780670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3395520).

2780670 is an abundant number, since it is smaller than the sum of its proper divisors (4010370).

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

2780670 is a wasteful number, since it uses less digits than its factorization.

2780670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 2780670 is about 1667.5341075972. The cubic root of 2780670 is about 140.6208818547.

The spelling of 2780670 in words is "two million, seven hundred eighty thousand, six hundred seventy".