83938978 has 4 divisors (see below), whose sum is σ = 125908470. Its totient is φ = 41969488.

The previous prime is 83938973. The next prime is 83938993. The reversal of 83938978 is 87983938.

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., 75742209 + 8196769 = 8703^2 + 2863^2 .

It is a super-3 number, since 3×83938978³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (83938973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20984743 + ... + 20984746.

Almost surely, 2^83938978 is an apocalyptic number.

83938978 is a deficient number, since it is larger than the sum of its proper divisors (41969492).

83938978 is a wasteful number, since it uses less digits than its factorization.

83938978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41969491.

The product of its digits is 2612736, while the sum is 55.

The square root of 83938978 is about 9161.8217620733. The cubic root of 83938978 is about 437.8458378947.

It can be divided in two parts, 8393 and 8978, that added together give a palindrome (17371).

The spelling of 83938978 in words is "eighty-three million, nine hundred thirty-eight thousand, nine hundred seventy-eight".