2487778 has 4 divisors (see below), whose sum is σ = 3731670. Its totient is φ = 1243888.

The previous prime is 2487773. The next prime is 2487787. The reversal of 2487778 is 8777842.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2380849 + 106929 = 1543^2 + 327^2 .

It is not an unprimeable number, because it can be changed into a prime (2487773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621943 + ... + 621946.

2^2487778 is an apocalyptic number.

2487778 is a deficient number, since it is larger than the sum of its proper divisors (1243892).

2487778 is a wasteful number, since it uses less digits than its factorization.

2487778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243891.

The product of its digits is 175616, while the sum is 43.

The square root of 2487778 is about 1577.2691590214. The cubic root of 2487778 is about 135.4993486804.

Subtracting 2487778 from its reverse (8777842), we obtain a square (6290064 = 2508²).

The spelling of 2487778 in words is "two million, four hundred eighty-seven thousand, seven hundred seventy-eight".