69920728 has 16 divisors (see below), whose sum is σ = 138813480. Its totient is φ = 32903808.

The previous prime is 69920693. The next prime is 69920743. The reversal of 69920728 is 82702996.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256926 + ... + 257197.

Almost surely, 2^69920728 is an apocalyptic number.

69920728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

69920728 is a deficient number, since it is larger than the sum of its proper divisors (68892752).

69920728 is a wasteful number, since it uses less digits than its factorization.

69920728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514146 (or 514142 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 69920728 is about 8361.8615152369. The cubic root of 69920728 is about 411.9728985849.

The spelling of 69920728 in words is "sixty-nine million, nine hundred twenty thousand, seven hundred twenty-eight".