4978894138 has 4 divisors (see below), whose sum is σ = 7468341210. Its totient is φ = 2489447068.

The previous prime is 4978894093. The next prime is 4978894171. The reversal of 4978894138 is 8314988794.

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., 4782137409 + 196756729 = 69153^2 + 14027^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1244723533 + ... + 1244723536.

Almost surely, 2^4978894138 is an apocalyptic number.

4978894138 is a deficient number, since it is larger than the sum of its proper divisors (2489447072).

4978894138 is a wasteful number, since it uses less digits than its factorization.

4978894138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489447071.

The product of its digits is 13934592, while the sum is 61.

The square root of 4978894138 is about 70561.2793109649. The cubic root of 4978894138 is about 1707.5665188628.

The spelling of 4978894138 in words is "four billion, nine hundred seventy-eight million, eight hundred ninety-four thousand, one hundred thirty-eight".