2778489 has 32 divisors (see below), whose sum is σ = 4801280. Its totient is φ = 1555200.

The previous prime is 2778481. The next prime is 2778521. The reversal of 2778489 is 9848772.

It is not a de Polignac number, because 2778489 - 2³ = 2778481 is a prime.

It is a super-2 number, since 2×2778489² = 15440002246242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 7 + 7⁶ + 8⁵ + 4³ + 8⁷ + 9⁴ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11409 + ... + 11649.

It is an arithmetic number, because the mean of its divisors is an integer number (150040).

2^2778489 is an apocalyptic number.

It is an amenable number.

2778489 is a deficient number, since it is larger than the sum of its proper divisors (2022791).

2778489 is a wasteful number, since it uses less digits than its factorization.

2778489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 312 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 2778489 is about 1666.8800196775. The cubic root of 2778489 is about 140.5841072209.

The spelling of 2778489 in words is "two million, seven hundred seventy-eight thousand, four hundred eighty-nine".