144721616 has 20 divisors (see below), whose sum is σ = 301967652. Its totient is φ = 66794496.

The previous prime is 144721597. The next prime is 144721667. The reversal of 144721616 is 616127441.

It can be written as a sum of positive squares in 2 ways, for example, as 12931216 + 131790400 = 3596^2 + 11480^2 .

It is a super-2 number, since 2×144721616² = 41888692275302912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347681 + ... + 348096.

Almost surely, 2^144721616 is an apocalyptic number.

144721616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

144721616 is an abundant number, since it is smaller than the sum of its proper divisors (157246036).

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

144721616 is a wasteful number, since it uses less digits than its factorization.

144721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695798 (or 695792 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 144721616 is about 12030.0297588992. The cubic root of 144721616 is about 525.0223615570.

The spelling of 144721616 in words is "one hundred forty-four million, seven hundred twenty-one thousand, six hundred sixteen".