145447424 has 40 divisors (see below), whose sum is σ = 295438308. Its totient is φ = 71516160.

The previous prime is 145447403. The next prime is 145447429. The reversal of 145447424 is 424744541.

It can be written as a sum of positive squares in 2 ways, for example, as 109830400 + 35617024 = 10480^2 + 5968^2 .

It is not an unprimeable number, because it can be changed into a prime (145447429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28904 + ... + 33560.

Almost surely, 2^145447424 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 145447424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147719154).

145447424 is an abundant number, since it is smaller than the sum of its proper divisors (149990884).

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

145447424 is an frugal number, since it uses more digits than its factorization.

145447424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736 (or 4720 counting only the distinct ones).

The product of its digits is 71680, while the sum is 35.

The square root of 145447424 is about 12060.1585395881. The cubic root of 145447424 is about 525.8985959206.

The spelling of 145447424 in words is "one hundred forty-five million, four hundred forty-seven thousand, four hundred twenty-four".