5638978 has 4 divisors (see below), whose sum is σ = 8458470. Its totient is φ = 2819488.

The previous prime is 5638967. The next prime is 5639003. The reversal of 5638978 is 8798365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8798365 = 5 ⋅1759673.

It can be written as a sum of positive squares in only one way, i.e., 4592449 + 1046529 = 2143^2 + 1023^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1409743 + ... + 1409746.

Almost surely, 2^5638978 is an apocalyptic number.

5638978 is a deficient number, since it is larger than the sum of its proper divisors (2819492).

5638978 is a wasteful number, since it uses less digits than its factorization.

5638978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819491.

The product of its digits is 362880, while the sum is 46.

The square root of 5638978 is about 2374.6532378434. The cubic root of 5638978 is about 177.9918567162.

The spelling of 5638978 in words is "five million, six hundred thirty-eight thousand, nine hundred seventy-eight".