609940235520 has 864 divisors, whose sum is σ = 2692416190464. Its totient is φ = 123785625600.

The previous prime is 609940235519. The next prime is 609940235537. The reversal of 609940235520 is 25532049906.

609940235520 is a `hidden beast` number, since 6 + 0 + 9 + 94 + 0 + 2 + 3 + 552 + 0 = 666.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 38134725 + ... + 38150715.

Almost surely, 2^609940235520 is an apocalyptic number.

609940235520 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 609940235520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346208095232).

609940235520 is an abundant number, since it is smaller than the sum of its proper divisors (2082475954944).

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

609940235520 is a wasteful number, since it uses less digits than its factorization.

609940235520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16079 (or 16062 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 609940235520 in words is "six hundred nine billion, nine hundred forty million, two hundred thirty-five thousand, five hundred twenty".