65388857 has 4 divisors (see below), whose sum is σ = 65407860. Its totient is φ = 65369856.

The previous prime is 65388833. The next prime is 65388859. The reversal of 65388857 is 75888356.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2725801 + 62663056 = 1651^2 + 7916^2 .

It is a cyclic number.

It is not a de Polignac number, because 65388857 - 2⁸ = 65388601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65388859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2732 + ... + 11757.

It is an arithmetic number, because the mean of its divisors is an integer number (16351965).

Almost surely, 2^65388857 is an apocalyptic number.

It is an amenable number.

65388857 is a deficient number, since it is larger than the sum of its proper divisors (19003).

65388857 is a wasteful number, since it uses less digits than its factorization.

65388857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19002.

The product of its digits is 1612800, while the sum is 50.

The square root of 65388857 is about 8086.3376753633. The cubic root of 65388857 is about 402.8727706626.

The spelling of 65388857 in words is "sixty-five million, three hundred eighty-eight thousand, eight hundred fifty-seven".