64965840 has 80 divisors (see below), whose sum is σ = 213254208. Its totient is φ = 16304128.

The previous prime is 64965833. The next prime is 64965841. The reversal of 64965840 is 4856946.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 64965792 and 64965801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64965841) 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, 3882 + ... + 12041.

Almost surely, 2^64965840 is an apocalyptic number.

64965840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64965840 is an abundant number, since it is smaller than the sum of its proper divisors (148288368).

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

64965840 is a wasteful number, since it uses less digits than its factorization.

64965840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15956 (or 15950 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 64965840 is about 8060.1389566186. The cubic root of 64965840 is about 402.0021286489.

The spelling of 64965840 in words is "sixty-four million, nine hundred sixty-five thousand, eight hundred forty".