144778749 has 16 divisors (see below), whose sum is σ = 209381760. Its totient is φ = 88624640.

The previous prime is 144778729. The next prime is 144778771. The reversal of 144778749 is 947877441.

144778749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 144778749 - 2⁵ = 144778717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144778709) 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, 32529 + ... + 36710.

It is an arithmetic number, because the mean of its divisors is an integer number (13086360).

Almost surely, 2^144778749 is an apocalyptic number.

It is an amenable number.

144778749 is a deficient number, since it is larger than the sum of its proper divisors (64603011).

144778749 is a wasteful number, since it uses less digits than its factorization.

144778749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69300.

The product of its digits is 1580544, while the sum is 51.

The square root of 144778749 is about 12032.4041238649. The cubic root of 144778749 is about 525.0914416686.

The spelling of 144778749 in words is "one hundred forty-four million, seven hundred seventy-eight thousand, seven hundred forty-nine".