289648856 has 32 divisors (see below), whose sum is σ = 657188640. Its totient is φ = 116832768.

The previous prime is 289648847. The next prime is 289648871. The reversal of 289648856 is 658846982.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151175 + ... + 153078.

It is an arithmetic number, because the mean of its divisors is an integer number (20537145).

Almost surely, 2^289648856 is an apocalyptic number.

It is an amenable number.

289648856 is an abundant number, since it is smaller than the sum of its proper divisors (367539784).

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

289648856 is a wasteful number, since it uses less digits than its factorization.

289648856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304283 (or 304279 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The square root of 289648856 is about 17019.0733002711. The cubic root of 289648856 is about 661.6433306562.

The spelling of 289648856 in words is "two hundred eighty-nine million, six hundred forty-eight thousand, eight hundred fifty-six".