145420644 has 24 divisors (see below), whose sum is σ = 339571008. Its totient is φ = 48436960.

The previous prime is 145420637. The next prime is 145420657. The reversal of 145420644 is 446024541.

It is a happy number.

It is a super-2 number, since 2×145420644² = 42294327402749472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15514 + ... + 23054.

It is an arithmetic number, because the mean of its divisors is an integer number (14148792).

Almost surely, 2^145420644 is an apocalyptic number.

It is an amenable number.

145420644 is an abundant number, since it is smaller than the sum of its proper divisors (194150364).

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

145420644 is a wasteful number, since it uses less digits than its factorization.

145420644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155 (or 9153 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 145420644 is about 12059.0482211491. The cubic root of 145420644 is about 525.8663175242.

The spelling of 145420644 in words is "one hundred forty-five million, four hundred twenty thousand, six hundred forty-four".