609213272778 has 96 divisors (see below), whose sum is σ = 1516493122560. Its totient is φ = 174807551520.

The previous prime is 609213272761. The next prime is 609213272821. The reversal of 609213272778 is 877272312906.

609213272778 is a `hidden beast` number, since 609 + 2 + 1 + 3 + 2 + 7 + 27 + 7 + 8 = 666.

It is a super-2 number, since 2×609213272778² (a number of 24 digits) contains 22 as substring.

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, 7797375 + ... + 7875117.

It is an arithmetic number, because the mean of its divisors is an integer number (15796803360).

Almost surely, 2^609213272778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 609213272778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758246561280).

609213272778 is an abundant number, since it is smaller than the sum of its proper divisors (907279849782).

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

609213272778 is a wasteful number, since it uses less digits than its factorization.

609213272778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79864 (or 79861 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 609213272778 in words is "six hundred nine billion, two hundred thirteen million, two hundred seventy-two thousand, seven hundred seventy-eight".