609890978 has 8 divisors (see below), whose sum is σ = 914943168. Its totient is φ = 304909924.

The previous prime is 609890971. The next prime is 609890989. The reversal of 609890978 is 879098906.

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

It is a super-3 number, since 3×609890978³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (609890971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18275 + ... + 39417.

It is an arithmetic number, because the mean of its divisors is an integer number (114367896).

Almost surely, 2^609890978 is an apocalyptic number.

609890978 is a deficient number, since it is larger than the sum of its proper divisors (305052190).

609890978 is a wasteful number, since it uses less digits than its factorization.

609890978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35568.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 609890978 is about 24695.9708859563. The cubic root of 609890978 is about 848.0420808372.

The spelling of 609890978 in words is "six hundred nine million, eight hundred ninety thousand, nine hundred seventy-eight".