64838940 has 24 divisors (see below), whose sum is σ = 181549200. Its totient is φ = 17290368.

The previous prime is 64838927. The next prime is 64839017. The reversal of 64838940 is 4983846.

It is a junction number, because it is equal to n+sod(n) for n = 64838892 and 64838901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540265 + ... + 540384.

It is an arithmetic number, because the mean of its divisors is an integer number (7564550).

Almost surely, 2^64838940 is an apocalyptic number.

64838940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64838940 is an abundant number, since it is smaller than the sum of its proper divisors (116710260).

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

64838940 is a wasteful number, since it uses less digits than its factorization.

64838940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080661 (or 1080659 counting only the distinct ones).

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

The square root of 64838940 is about 8052.2630359421. The cubic root of 64838940 is about 401.7402098617.

The spelling of 64838940 in words is "sixty-four million, eight hundred thirty-eight thousand, nine hundred forty".