609657840 has 240 divisors, whose sum is σ = 2317101696. Its totient is φ = 147744000.

The previous prime is 609657779. The next prime is 609657869. The reversal of 609657840 is 48756906.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 212415 + ... + 215265.

Almost surely, 2^609657840 is an apocalyptic number.

609657840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 609657840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158550848).

609657840 is an abundant number, since it is smaller than the sum of its proper divisors (1707443856).

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

609657840 is a wasteful number, since it uses less digits than its factorization.

609657840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 609657840 is about 24691.2502721106. The cubic root of 609657840 is about 847.9340090454.

It can be divided in two parts, 6096 and 57840, that added together give a palindrome (63936).

The spelling of 609657840 in words is "six hundred nine million, six hundred fifty-seven thousand, eight hundred forty".