145645440 has 128 divisors (see below), whose sum is σ = 479416320. Its totient is φ = 37570560.

The previous prime is 145645421. The next prime is 145645457. The reversal of 145645440 is 44546541.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 58297 + ... + 60743.

It is an arithmetic number, because the mean of its divisors is an integer number (3745440).

Almost surely, 2^145645440 is an apocalyptic number.

145645440 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 145645440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239708160).

145645440 is an abundant number, since it is smaller than the sum of its proper divisors (333770880).

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

145645440 is a wasteful number, since it uses less digits than its factorization.

145645440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500 (or 2488 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

The square root of 145645440 is about 12068.3652579792. The cubic root of 145645440 is about 526.1371451531.

The spelling of 145645440 in words is "one hundred forty-five million, six hundred forty-five thousand, four hundred forty".