609978779136 has 120 divisors (see below), whose sum is σ = 1763541556920. Its totient is φ = 202968047616.

The previous prime is 609978779117. The next prime is 609978779143. The reversal of 609978779136 is 631977879906.

It is a happy number.

609978779136 is a `hidden beast` number, since 609 + 9 + 7 + 8 + 7 + 7 + 9 + 1 + 3 + 6 = 666.

It is a super-2 number, since 2×609978779136² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2505631 + ... + 2738273.

It is an arithmetic number, because the mean of its divisors is an integer number (14696179641).

Almost surely, 2^609978779136 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 609978779136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881770778460).

609978779136 is an abundant number, since it is smaller than the sum of its proper divisors (1153562777784).

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

609978779136 is a wasteful number, since it uses less digits than its factorization.

609978779136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233236 (or 233217 counting only the distinct ones).

The product of its (nonzero) digits is 216040608, while the sum is 72.

The spelling of 609978779136 in words is "six hundred nine billion, nine hundred seventy-eight million, seven hundred seventy-nine thousand, one hundred thirty-six".