868404061924 has 135 divisors (see below), whose sum is σ = 1829214458043. Its totient is φ = 360705429504.

The previous prime is 868404061907. The next prime is 868404061927. The reversal of 868404061924 is 429160404868.

The square root of 868404061924 is 931882.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 700599132324 + 167804929600 = 837018^2 + 409640^2 .

It is a super-2 number, since 2×868404061924² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (868404061927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3379004004 + ... + 3379004260.

Almost surely, 2^868404061924 is an apocalyptic number.

868404061924 is the 931882-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 868404061924

868404061924 is an abundant number, since it is smaller than the sum of its proper divisors (960810396119).

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

868404061924 is an frugal number, since it uses more digits than its factorization.

868404061924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 868404061924 in words is "eight hundred sixty-eight billion, four hundred four million, sixty-one thousand, nine hundred twenty-four".