801289978 has 8 divisors (see below), whose sum is σ = 1231250580. Its totient is φ = 390873120.

The previous prime is 801289963. The next prime is 801289991. The reversal of 801289978 is 879982108.

It can be written as a sum of positive squares in 2 ways, for example, as 799928089 + 1361889 = 28283^2 + 1167^2 .

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4885833 + ... + 4885996.

Almost surely, 2^801289978 is an apocalyptic number.

801289978 is a deficient number, since it is larger than the sum of its proper divisors (429960602).

801289978 is a wasteful number, since it uses less digits than its factorization.

801289978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9771872.

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

The square root of 801289978 is about 28307.0658670234. The cubic root of 801289978 is about 928.8164610649.

The spelling of 801289978 in words is "eight hundred one million, two hundred eighty-nine thousand, nine hundred seventy-eight".