145331644 has 24 divisors (see below), whose sum is σ = 264297600. Its totient is φ = 69840960.

The previous prime is 145331629. The next prime is 145331647. The reversal of 145331644 is 446133541.

It is a happy number.

145331644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×145331644² = 42242573495485472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145331647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23829 + ... + 29299.

It is an arithmetic number, because the mean of its divisors is an integer number (11012400).

Almost surely, 2^145331644 is an apocalyptic number.

It is an amenable number.

145331644 is a deficient number, since it is larger than the sum of its proper divisors (118965956).

145331644 is a wasteful number, since it uses less digits than its factorization.

145331644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733 (or 5731 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 145331644 is about 12055.3574812197. The cubic root of 145331644 is about 525.7590158093.

The spelling of 145331644 in words is "one hundred forty-five million, three hundred thirty-one thousand, six hundred forty-four".