64613887 has 8 divisors (see below), whose sum is σ = 69646640. Its totient is φ = 59590080.

The previous prime is 64613881. The next prime is 64613921. The reversal of 64613887 is 78831646.

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

It is a cyclic number.

It is not a de Polignac number, because 64613887 - 2¹⁵ = 64581119 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 (64613881) 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, 27187 + ... + 29467.

It is an arithmetic number, because the mean of its divisors is an integer number (8705830).

Almost surely, 2^64613887 is an apocalyptic number.

64613887 is a deficient number, since it is larger than the sum of its proper divisors (5032753).

64613887 is a wasteful number, since it uses less digits than its factorization.

64613887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473.

The product of its digits is 193536, while the sum is 43.

The square root of 64613887 is about 8038.2763699689. The cubic root of 64613887 is about 401.2748637394.

The spelling of 64613887 in words is "sixty-four million, six hundred thirteen thousand, eight hundred eighty-seven".