609628240 has 80 divisors (see below), whose sum is σ = 1531152000. Its totient is φ = 224395776.

The previous prime is 609628231. The next prime is 609628273. The reversal of 609628240 is 42826906.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 609628240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435061 + ... + 436459.

It is an arithmetic number, because the mean of its divisors is an integer number (19139400).

Almost surely, 2^609628240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 609628240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765576000).

609628240 is an abundant number, since it is smaller than the sum of its proper divisors (921523760).

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

609628240 is a wasteful number, since it uses less digits than its factorization.

609628240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 609628240 is about 24690.6508622191. The cubic root of 609628240 is about 847.9202859091.

It can be divided in two parts, 609 and 628240, that added together give a square (628849 = 793²).

The spelling of 609628240 in words is "six hundred nine million, six hundred twenty-eight thousand, two hundred forty".