5639978 has 8 divisors (see below), whose sum is σ = 8751780. Its totient is φ = 2722720.

The previous prime is 5639969. The next prime is 5639981. The reversal of 5639978 is 8799365.

It can be written as a sum of positive squares in 2 ways, for example, as 4870849 + 769129 = 2207^2 + 877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48563 + ... + 48678.

Almost surely, 2^5639978 is an apocalyptic number.

5639978 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

5639978 is a deficient number, since it is larger than the sum of its proper divisors (3111802).

5639978 is a wasteful number, since it uses less digits than its factorization.

5639978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97272.

The product of its digits is 408240, while the sum is 47.

The square root of 5639978 is about 2374.8637855675. The cubic root of 5639978 is about 178.0023776142.

The spelling of 5639978 in words is "five million, six hundred thirty-nine thousand, nine hundred seventy-eight".