9642778 has 4 divisors (see below), whose sum is σ = 14464170. Its totient is φ = 4821388.

The previous prime is 9642769. The next prime is 9642799. The reversal of 9642778 is 8772469.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8772469 = 2053 ⋅4273.

It can be written as a sum of positive squares in only one way, i.e., 5076009 + 4566769 = 2253^2 + 2137^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2410693 + ... + 2410696.

Almost surely, 2^9642778 is an apocalyptic number.

9642778 is a deficient number, since it is larger than the sum of its proper divisors (4821392).

9642778 is a wasteful number, since it uses less digits than its factorization.

9642778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821391.

The product of its digits is 169344, while the sum is 43.

The square root of 9642778 is about 3105.2822738038. The cubic root of 9642778 is about 212.8469294852.

The spelling of 9642778 in words is "nine million, six hundred forty-two thousand, seven hundred seventy-eight".