2781478 has 16 divisors (see below), whose sum is σ = 4847904. Its totient is φ = 1172160.

The previous prime is 2781469. The next prime is 2781487. The reversal of 2781478 is 8741872.

It is an interprime number because it is at equal distance from previous prime (2781469) and next prime (2781487).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775 + ... + 2482.

It is an arithmetic number, because the mean of its divisors is an integer number (302994).

2^2781478 is an apocalyptic number.

2781478 is a deficient number, since it is larger than the sum of its proper divisors (2066426).

2781478 is a wasteful number, since it uses less digits than its factorization.

2781478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327.

The product of its digits is 25088, while the sum is 37.

The square root of 2781478 is about 1667.7763639049. The cubic root of 2781478 is about 140.6345009548.

The spelling of 2781478 in words is "two million, seven hundred eighty-one thousand, four hundred seventy-eight".