64655887 has 4 divisors (see below), whose sum is σ = 65043216. Its totient is φ = 64268560.

The previous prime is 64655873. The next prime is 64655911. The reversal of 64655887 is 78855646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78855646 = 2 ⋅39427823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64655887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64655887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64655867) 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, 193414 + ... + 193747.

It is an arithmetic number, because the mean of its divisors is an integer number (16260804).

Almost surely, 2^64655887 is an apocalyptic number.

64655887 is a deficient number, since it is larger than the sum of its proper divisors (387329).

64655887 is a wasteful number, since it uses less digits than its factorization.

64655887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387328.

The product of its digits is 1612800, while the sum is 49.

The square root of 64655887 is about 8040.8884459368. Note that the first 3 decimals coincide. The cubic root of 64655887 is about 401.3617898100.

The spelling of 64655887 in words is "sixty-four million, six hundred fifty-five thousand, eight hundred eighty-seven".