2781480 has 64 divisors (see below), whose sum is σ = 8991360. Its totient is φ = 684288.

The previous prime is 2781469. The next prime is 2781487. The reversal of 2781480 is 841872.

It is a super-3 number, since 3×2781480³ = 64557853101533376000, which contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (2781487) 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, 669 + ... + 2451.

It is an arithmetic number, because the mean of its divisors is an integer number (140490).

2^2781480 is an apocalyptic number.

2781480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2781480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4495680).

2781480 is an abundant number, since it is smaller than the sum of its proper divisors (6209880).

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

2781480 is a wasteful number, since it uses less digits than its factorization.

2781480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 2781480 is about 1667.7769635056. The cubic root of 2781480 is about 140.6345346622.

The spelling of 2781480 in words is "two million, seven hundred eighty-one thousand, four hundred eighty".