64813887 has 6 divisors (see below), whose sum is σ = 93620072. Its totient is φ = 43209252.

The previous prime is 64813867. The next prime is 64813897. The reversal of 64813887 is 78831846.

It is not a de Polignac number, because 64813887 - 2⁸ = 64813631 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 (64813867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3600763 + ... + 3600780.

Almost surely, 2^64813887 is an apocalyptic number.

64813887 is a deficient number, since it is larger than the sum of its proper divisors (28806185).

64813887 is a wasteful number, since it uses less digits than its factorization.

64813887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7201549 (or 7201546 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 64813887 is about 8050.7072360135. The cubic root of 64813887 is about 401.6884606399.

It can be divided in two parts, 648 and 13887, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 64813887 in words is "sixty-four million, eight hundred thirteen thousand, eight hundred eighty-seven".