83928978 has 48 divisors (see below), whose sum is σ = 216867456. Its totient is φ = 22936320.

The previous prime is 83928961. The next prime is 83928979. The reversal of 83928978 is 87982938.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83928979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11583 + ... + 17378.

It is an arithmetic number, because the mean of its divisors is an integer number (4518072).

Almost surely, 2^83928978 is an apocalyptic number.

83928978 is an abundant number, since it is smaller than the sum of its proper divisors (132938478).

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

83928978 is a wasteful number, since it uses less digits than its factorization.

83928978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28999 (or 28996 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 83928978 is about 9161.2760028284. The cubic root of 83928978 is about 437.8284497381.

The spelling of 83928978 in words is "eighty-three million, nine hundred twenty-eight thousand, nine hundred seventy-eight".