64390140 has 72 divisors (see below), whose sum is σ = 202566000. Its totient is φ = 17169408.

The previous prime is 64390103. The next prime is 64390159. The reversal of 64390140 is 4109346.

64390140 is a `hidden beast` number, since 643 + 9 + 0 + 14 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1765 + ... + 11484.

Almost surely, 2^64390140 is an apocalyptic number.

64390140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64390140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101283000).

64390140 is an abundant number, since it is smaller than the sum of its proper divisors (138175860).

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

64390140 is a wasteful number, since it uses less digits than its factorization.

64390140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13273 (or 13259 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 64390140 is about 8024.3467023802. The cubic root of 64390140 is about 400.8111456616.

Adding to 64390140 its reverse (4109346), we get a palindrome (68499486).

The spelling of 64390140 in words is "sixty-four million, three hundred ninety thousand, one hundred forty".