64831940 has 24 divisors (see below), whose sum is σ = 142067520. Its totient is φ = 24805088.

The previous prime is 64831939. The next prime is 64831969. The reversal of 64831940 is 4913846.

64831940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64831940.

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 7 ways as a sum of consecutive naturals, for example, 70010 + ... + 70929.

It is an arithmetic number, because the mean of its divisors is an integer number (5919480).

Almost surely, 2^64831940 is an apocalyptic number.

It is an amenable number.

64831940 is an abundant number, since it is smaller than the sum of its proper divisors (77235580).

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

64831940 is a wasteful number, since it uses less digits than its factorization.

64831940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140971 (or 140969 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 64831940 is about 8051.8283637942. The cubic root of 64831940 is about 401.7257520751.

The spelling of 64831940 in words is "sixty-four million, eight hundred thirty-one thousand, nine hundred forty".