64938840 has 64 divisors (see below), whose sum is σ = 196581600. Its totient is φ = 17160192.

The previous prime is 64938817. The next prime is 64938847. The reversal of 64938840 is 4883946.

64938840 is nontrivially palindromic in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 64938792 and 64938801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64938847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11166 + ... + 15954.

Almost surely, 2^64938840 is an apocalyptic number.

64938840 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 64938840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98290800).

64938840 is an abundant number, since it is smaller than the sum of its proper divisors (131642760).

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

64938840 is a wasteful number, since it uses less digits than its factorization.

64938840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916 (or 4912 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 64938840 is about 8058.4638734687. The cubic root of 64938840 is about 401.9464298310.

The spelling of 64938840 in words is "sixty-four million, nine hundred thirty-eight thousand, eight hundred forty".