147221568 has 84 divisors (see below), whose sum is σ = 454467468. Its totient is φ = 45296640.

The previous prime is 147221537. The next prime is 147221629. The reversal of 147221568 is 865122741.

147221568 is a `hidden beast` number, since 1 + 4 + 72 + 21 + 568 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49449024 + 97772544 = 7032^2 + 9888^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 2343 + ... + 17318.

It is an arithmetic number, because the mean of its divisors is an integer number (5410327).

Almost surely, 2^147221568 is an apocalyptic number.

147221568 is a gapful number since it is divisible by the number (18) 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 147221568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227233734).

147221568 is an abundant number, since it is smaller than the sum of its proper divisors (307245900).

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

147221568 is a wasteful number, since it uses less digits than its factorization.

147221568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19692 (or 19679 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 147221568 is about 12133.4895228042. The cubic root of 147221568 is about 528.0282354047.

It can be divided in two parts, 14722 and 1568, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 147221568 in words is "one hundred forty-seven million, two hundred twenty-one thousand, five hundred sixty-eight".