145651644 has 72 divisors (see below), whose sum is σ = 392996240. Its totient is φ = 45349632.

The previous prime is 145651643. The next prime is 145651661. The reversal of 145651644 is 446156541.

145651644 is a `hidden beast` number, since 1 + 4 + 5 + 6 + 5 + 1 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 145651599 and 145651608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145651643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48474 + ... + 51390.

Almost surely, 2^145651644 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 145651644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196498120).

145651644 is an abundant number, since it is smaller than the sum of its proper divisors (247344596).

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

145651644 is a wasteful number, since it uses less digits than its factorization.

145651644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019 (or 3014 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 145651644 is about 12068.6222908831. The cubic root of 145651644 is about 526.1446155975.

The spelling of 145651644 in words is "one hundred forty-five million, six hundred fifty-one thousand, six hundred forty-four".