83978458 has 4 divisors (see below), whose sum is σ = 125967690. Its totient is φ = 41989228.

The previous prime is 83978443. The next prime is 83978471. The reversal of 83978458 is 85487938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85487938 = 2 ⋅42743969.

It can be written as a sum of positive squares in only one way, i.e., 73564929 + 10413529 = 8577^2 + 3227^2 .

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 as a sum of consecutive naturals, namely, 20994613 + ... + 20994616.

Almost surely, 2^83978458 is an apocalyptic number.

83978458 is a deficient number, since it is larger than the sum of its proper divisors (41989232).

83978458 is a wasteful number, since it uses less digits than its factorization.

83978458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41989231.

The product of its digits is 1935360, while the sum is 52.

The square root of 83978458 is about 9163.9761021076. The cubic root of 83978458 is about 437.9144728510.

It can be divided in two parts, 839 and 78458, that added together give a palindrome (79297).

The spelling of 83978458 in words is "eighty-three million, nine hundred seventy-eight thousand, four hundred fifty-eight".