209230757964 has 288 divisors, whose sum is σ = 587545056000. Its totient is φ = 64205084160.

The previous prime is 209230757929. The next prime is 209230757969. The reversal of 209230757964 is 469757032902.

209230757964 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 3 + 0 + 7 + 579 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 209230757964.

It is not an unprimeable number, because it can be changed into a prime (209230757969) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1168886827 + ... + 1168887005.

It is an arithmetic number, because the mean of its divisors is an integer number (2040087000).

Almost surely, 2^209230757964 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 209230757964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293772528000).

209230757964 is an abundant number, since it is smaller than the sum of its proper divisors (378314298036).

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

209230757964 is a wasteful number, since it uses less digits than its factorization.

209230757964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 209230757964 in words is "two hundred nine billion, two hundred thirty million, seven hundred fifty-seven thousand, nine hundred sixty-four".