69144978 has 48 divisors (see below), whose sum is σ = 161681184. Its totient is φ = 19656000.

The previous prime is 69144949. The next prime is 69144979. The reversal of 69144978 is 87944196.

It is not an unprimeable number, because it can be changed into a prime (69144979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73326 + ... + 74262.

It is an arithmetic number, because the mean of its divisors is an integer number (3368358).

Almost surely, 2^69144978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69144978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80840592).

69144978 is an abundant number, since it is smaller than the sum of its proper divisors (92536206).

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

69144978 is a wasteful number, since it uses less digits than its factorization.

69144978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207 (or 1200 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 69144978 is about 8315.3459338743. The cubic root of 69144978 is about 410.4436561784.

The spelling of 69144978 in words is "sixty-nine million, one hundred forty-four thousand, nine hundred seventy-eight".