69287257 has 8 divisors (see below), whose sum is σ = 79006536. Its totient is φ = 60195072.

The previous prime is 69287227. The next prime is 69287279. The reversal of 69287257 is 75278296.

It can be written as a sum of positive squares in 4 ways, for example, as 4822416 + 64464841 = 2196^2 + 8029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69287257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69287227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156538 + ... + 156979.

It is an arithmetic number, because the mean of its divisors is an integer number (9875817).

Almost surely, 2^69287257 is an apocalyptic number.

It is an amenable number.

69287257 is a deficient number, since it is larger than the sum of its proper divisors (9719279).

69287257 is a wasteful number, since it uses less digits than its factorization.

69287257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313547.

The product of its digits is 423360, while the sum is 46.

The square root of 69287257 is about 8323.8967437132. The cubic root of 69287257 is about 410.7249853783.

The spelling of 69287257 in words is "sixty-nine million, two hundred eighty-seven thousand, two hundred fifty-seven".