144220657 has 16 divisors (see below), whose sum is σ = 170376192. Its totient is φ = 119508480.

The previous prime is 144220613. The next prime is 144220679. The reversal of 144220657 is 756022441.

It is not a de Polignac number, because 144220657 - 2⁷ = 144220529 is a prime.

144220657 is a Rhonda number in base 9.

It is not an unprimeable number, because it can be changed into a prime (144220157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30208 + ... + 34654.

It is an arithmetic number, because the mean of its divisors is an integer number (10648512).

Almost surely, 2^144220657 is an apocalyptic number.

It is an amenable number.

144220657 is a deficient number, since it is larger than the sum of its proper divisors (26155535).

144220657 is a wasteful number, since it uses less digits than its factorization.

144220657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 144220657 is about 12009.1905222625. The cubic root of 144220657 is about 524.4158667161.

The spelling of 144220657 in words is "one hundred forty-four million, two hundred twenty thousand, six hundred fifty-seven".