5378729978 has 4 divisors (see below), whose sum is σ = 8068094970. Its totient is φ = 2689364988.

The previous prime is 5378729971. The next prime is 5378729981. The reversal of 5378729978 is 8799278735.

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., 5213273209 + 165456769 = 72203^2 + 12863^2 .

It is not an unprimeable number, because it can be changed into a prime (5378729971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344682493 + ... + 1344682496.

Almost surely, 2^5378729978 is an apocalyptic number.

5378729978 is a deficient number, since it is larger than the sum of its proper divisors (2689364992).

5378729978 is a wasteful number, since it uses less digits than its factorization.

5378729978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689364991.

The product of its digits is 53343360, while the sum is 65.

The square root of 5378729978 is about 73339.8253202174. The cubic root of 5378729978 is about 1752.1041333284.

The spelling of 5378729978 in words is "five billion, three hundred seventy-eight million, seven hundred twenty-nine thousand, nine hundred seventy-eight".