83840478 has 8 divisors (see below), whose sum is σ = 167680968. Its totient is φ = 27946824.

The previous prime is 83840473. The next prime is 83840489. The reversal of 83840478 is 87404838.

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

83840478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83840473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6986701 + ... + 6986712.

It is an arithmetic number, because the mean of its divisors is an integer number (20960121).

Almost surely, 2^83840478 is an apocalyptic number.

83840478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83840478 is a wasteful number, since it uses less digits than its factorization.

83840478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13973418.

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 83840478 is about 9156.4446156792. Note that the first 3 decimals coincide. The cubic root of 83840478 is about 437.6745043187.

The spelling of 83840478 in words is "eighty-three million, eight hundred forty thousand, four hundred seventy-eight".