64538840 has 16 divisors (see below), whose sum is σ = 145212480. Its totient is φ = 25815520.

The previous prime is 64538821. The next prime is 64538857. The reversal of 64538840 is 4883546.

It is a happy number.

64538840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×64538840³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64538794 and 64538803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806696 + ... + 806775.

It is an arithmetic number, because the mean of its divisors is an integer number (9075780).

Almost surely, 2^64538840 is an apocalyptic number.

It is an amenable number.

64538840 is an abundant number, since it is smaller than the sum of its proper divisors (80673640).

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

64538840 is a wasteful number, since it uses less digits than its factorization.

64538840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613482 (or 1613478 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 64538840 is about 8033.6069109709. The cubic root of 64538840 is about 401.1194475039.

The spelling of 64538840 in words is "sixty-four million, five hundred thirty-eight thousand, eight hundred forty".