65861887 has 32 divisors (see below), whose sum is σ = 86073344. Its totient is φ = 48988800.

The previous prime is 65861879. The next prime is 65861891. The reversal of 65861887 is 78816856.

It is not a de Polignac number, because 65861887 - 2³ = 65861879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65861887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65865887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104062 + ... + 104692.

It is an arithmetic number, because the mean of its divisors is an integer number (2689792).

Almost surely, 2^65861887 is an apocalyptic number.

65861887 is a deficient number, since it is larger than the sum of its proper divisors (20211457).

65861887 is a wasteful number, since it uses less digits than its factorization.

65861887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719.

The product of its digits is 645120, while the sum is 49.

The square root of 65861887 is about 8115.5336854701. The cubic root of 65861887 is about 403.8419123820.

The spelling of 65861887 in words is "sixty-five million, eight hundred sixty-one thousand, eight hundred eighty-seven".