189028978 has 8 divisors (see below), whose sum is σ = 284063472. Its totient is φ = 94341156.

The previous prime is 189028951. The next prime is 189028997. The reversal of 189028978 is 879820981.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85300 + ... + 87487.

It is an arithmetic number, because the mean of its divisors is an integer number (35507934).

Almost surely, 2^189028978 is an apocalyptic number.

189028978 is a deficient number, since it is larger than the sum of its proper divisors (95034494).

189028978 is a wasteful number, since it uses less digits than its factorization.

189028978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173336.

The product of its (nonzero) digits is 580608, while the sum is 52.

The square root of 189028978 is about 13748.7809641437. The cubic root of 189028978 is about 573.9086829201.

The spelling of 189028978 in words is "one hundred eighty-nine million, twenty-eight thousand, nine hundred seventy-eight".