145644440 has 96 divisors (see below), whose sum is σ = 357421680. Its totient is φ = 53372928.

The previous prime is 145644437. The next prime is 145644451. The reversal of 145644440 is 44446541.

145644440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 145644397 and 145644406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 496934 + ... + 497226.

Almost surely, 2^145644440 is an apocalyptic number.

145644440 is a gapful number since it is divisible by the number (10) 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 145644440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178710840).

145644440 is an abundant number, since it is smaller than the sum of its proper divisors (211777240).

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

145644440 is a wasteful number, since it uses less digits than its factorization.

145644440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

The square root of 145644440 is about 12068.3238272761. The cubic root of 145644440 is about 526.1359409997.

The spelling of 145644440 in words is "one hundred forty-five million, six hundred forty-four thousand, four hundred forty".