2691280 has 20 divisors (see below), whose sum is σ = 6257412. Its totient is φ = 1076480.

The previous prime is 2691277. The next prime is 2691317. The reversal of 2691280 is 821962.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1617984 + 1073296 = 1272^2 + 1036^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16741 + ... + 16900.

2^2691280 is an apocalyptic number.

2691280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2691280 is an abundant number, since it is smaller than the sum of its proper divisors (3566132).

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

2691280 is a wasteful number, since it uses less digits than its factorization.

2691280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33654 (or 33648 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2691280 is about 1640.5121151640. The cubic root of 2691280 is about 139.0975972095.

The spelling of 2691280 in words is "two million, six hundred ninety-one thousand, two hundred eighty".