868990572 has 72 divisors (see below), whose sum is σ = 2313109680. Its totient is φ = 281960640.

The previous prime is 868990541. The next prime is 868990607. The reversal of 868990572 is 275099868.

It is a happy number.

868990572 is a `hidden beast` number, since 8 + 68 + 9 + 9 + 0 + 572 = 666.

It is a super-2 number, since 2×868990572² = 1510289228449774368, which contains 22 as substring.

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1961383 + ... + 1961825.

Almost surely, 2^868990572 is an apocalyptic number.

868990572 is a gapful number since it is divisible by the number (82) 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 868990572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1156554840).

868990572 is an abundant number, since it is smaller than the sum of its proper divisors (1444119108).

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

868990572 is a wasteful number, since it uses less digits than its factorization.

868990572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 868990572 is about 29478.6460340362. The cubic root of 868990572 is about 954.2709170848.

The spelling of 868990572 in words is "eight hundred sixty-eight million, nine hundred ninety thousand, five hundred seventy-two".