69733728 has 72 divisors (see below), whose sum is σ = 209985048. Its totient is φ = 21875712.

The previous prime is 69733721. The next prime is 69733739. The reversal of 69733728 is 82733796.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69733721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2226 + ... + 12017.

It is an arithmetic number, because the mean of its divisors is an integer number (2916459).

Almost surely, 2^69733728 is an apocalyptic number.

69733728 is a gapful number since it is divisible by the number (68) 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 69733728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104992524).

69733728 is an abundant number, since it is smaller than the sum of its proper divisors (140251320).

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

69733728 is a wasteful number, since it uses less digits than its factorization.

69733728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14276 (or 14265 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 69733728 is about 8350.6723082636. The cubic root of 69733728 is about 411.6053027109.

It can be divided in two parts, 6973 and 3728, that added together give a palindrome (10701).

The spelling of 69733728 in words is "sixty-nine million, seven hundred thirty-three thousand, seven hundred twenty-eight".