69986728 has 32 divisors (see below), whose sum is σ = 157867200. Its totient is φ = 28415232.

The previous prime is 69986689. The next prime is 69986729. The reversal of 69986728 is 82768996.

It is a super-2 number, since 2×69986728² = 9796284192291968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (69986729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31825 + ... + 33952.

It is an arithmetic number, because the mean of its divisors is an integer number (4933350).

Almost surely, 2^69986728 is an apocalyptic number.

It is an amenable number.

69986728 is an abundant number, since it is smaller than the sum of its proper divisors (87880472).

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

69986728 is a wasteful number, since it uses less digits than its factorization.

69986728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65809 (or 65805 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The square root of 69986728 is about 8365.8070740366. The cubic root of 69986728 is about 412.1024818114.

The spelling of 69986728 in words is "sixty-nine million, nine hundred eighty-six thousand, seven hundred twenty-eight".