69840728 has 8 divisors (see below), whose sum is σ = 130951380. Its totient is φ = 34920360.

The previous prime is 69840707. The next prime is 69840761. The reversal of 69840728 is 82704896.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4365038 + ... + 4365053.

Almost surely, 2^69840728 is an apocalyptic number.

It is an amenable number.

69840728 is a deficient number, since it is larger than the sum of its proper divisors (61110652).

69840728 is a wasteful number, since it uses less digits than its factorization.

69840728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730097 (or 8730093 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 69840728 is about 8357.0765223253. The cubic root of 69840728 is about 411.8157186354.

The spelling of 69840728 in words is "sixty-nine million, eight hundred forty thousand, seven hundred twenty-eight".