144720640 has 36 divisors (see below), whose sum is σ = 346654224. Its totient is φ = 57887744.

The previous prime is 144720637. The next prime is 144720647. The reversal of 144720640 is 46027441.

It is a junction number, because it is equal to n+sod(n) for n = 144720599 and 144720608.

It is not an unprimeable number, because it can be changed into a prime (144720647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55252 + ... + 57811.

It is an arithmetic number, because the mean of its divisors is an integer number (9629284).

Almost surely, 2^144720640 is an apocalyptic number.

144720640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144720640 is an abundant number, since it is smaller than the sum of its proper divisors (201933584).

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

144720640 is an equidigital number, since it uses as much as digits as its factorization.

144720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113084 (or 113070 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 144720640 is about 12029.9891936776. The cubic root of 144720640 is about 525.0211813072.

The spelling of 144720640 in words is "one hundred forty-four million, seven hundred twenty thousand, six hundred forty".