64587138 has 96 divisors (see below), whose sum is σ = 165473280. Its totient is φ = 16447200.

The previous prime is 64587119. The next prime is 64587139. The reversal of 64587138 is 83178546.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64587138.

It is not an unprimeable number, because it can be changed into a prime (64587139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 360733 + ... + 360911.

It is an arithmetic number, because the mean of its divisors is an integer number (1723680).

Almost surely, 2^64587138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64587138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82736640).

64587138 is an abundant number, since it is smaller than the sum of its proper divisors (100886142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64587138 is a wasteful number, since it uses less digits than its factorization.

64587138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 273 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 64587138 is about 8036.6123460075. The cubic root of 64587138 is about 401.2194825443.

The spelling of 64587138 in words is "sixty-four million, five hundred eighty-seven thousand, one hundred thirty-eight".