8542778 has 4 divisors (see below), whose sum is σ = 12814170. Its totient is φ = 4271388.

The previous prime is 8542777. The next prime is 8542811. The reversal of 8542778 is 8772458.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8772458 = 2 ⋅4386229.

It can be written as a sum of positive squares in only one way, i.e., 8048569 + 494209 = 2837^2 + 703^2 .

It is not an unprimeable number, because it can be changed into a prime (8542771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2135693 + ... + 2135696.

Almost surely, 2^8542778 is an apocalyptic number.

8542778 is a deficient number, since it is larger than the sum of its proper divisors (4271392).

8542778 is a wasteful number, since it uses less digits than its factorization.

8542778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271391.

The product of its digits is 125440, while the sum is 41.

The square root of 8542778 is about 2922.8031066084. The cubic root of 8542778 is about 204.4245451865.

The spelling of 8542778 in words is "eight million, five hundred forty-two thousand, seven hundred seventy-eight".