139069728 has 144 divisors (see below), whose sum is σ = 457119936. Its totient is φ = 39283200.

The previous prime is 139069687. The next prime is 139069729. The reversal of 139069728 is 827960931.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-3 number, since 3×139069728³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (139069729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203275 + ... + 203957.

It is an arithmetic number, because the mean of its divisors is an integer number (3174444).

Almost surely, 2^139069728 is an apocalyptic number.

139069728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139069728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228559968).

139069728 is an abundant number, since it is smaller than the sum of its proper divisors (318050208).

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

139069728 is a wasteful number, since it uses less digits than its factorization.

139069728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 139069728 is about 11792.7828776757. The cubic root of 139069728 is about 518.0967505114.

The spelling of 139069728 in words is "one hundred thirty-nine million, sixty-nine thousand, seven hundred twenty-eight".