69928387 has 4 divisors (see below), whose sum is σ = 71074816. Its totient is φ = 68781960.

The previous prime is 69928381. The next prime is 69928423. The reversal of 69928387 is 78382996.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69928387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69928381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573123 + ... + 573244.

It is an arithmetic number, because the mean of its divisors is an integer number (17768704).

Almost surely, 2^69928387 is an apocalyptic number.

69928387 is a deficient number, since it is larger than the sum of its proper divisors (1146429).

69928387 is a wasteful number, since it uses less digits than its factorization.

69928387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146428.

The product of its digits is 1306368, while the sum is 52.

The square root of 69928387 is about 8362.3194748826. The cubic root of 69928387 is about 411.9879403106.

The spelling of 69928387 in words is "sixty-nine million, nine hundred twenty-eight thousand, three hundred eighty-seven".