64533887 has 16 divisors (see below), whose sum is σ = 74807712. Its totient is φ = 55019520.

The previous prime is 64533869. The next prime is 64533923. The reversal of 64533887 is 78833546.

It is a cyclic number.

It is not a de Polignac number, because 64533887 - 2¹⁰ = 64532863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64533187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80573 + ... + 81369.

It is an arithmetic number, because the mean of its divisors is an integer number (4675482).

Almost surely, 2^64533887 is an apocalyptic number.

64533887 is a deficient number, since it is larger than the sum of its proper divisors (10273825).

64533887 is a wasteful number, since it uses less digits than its factorization.

64533887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its digits is 483840, while the sum is 44.

The square root of 64533887 is about 8033.2986375461. The cubic root of 64533887 is about 401.1091860064.

The spelling of 64533887 in words is "sixty-four million, five hundred thirty-three thousand, eight hundred eighty-seven".