64965640 has 16 divisors (see below), whose sum is σ = 146172780. Its totient is φ = 25986240.

The previous prime is 64965631. The next prime is 64965643. The reversal of 64965640 is 4656946.

64965640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54967396 + 9998244 = 7414^2 + 3162^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1624141 = 64965640 / (6 + 4 + 9 + 6 + 5 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 64965593 and 64965602.

It is not an unprimeable number, because it can be changed into a prime (64965643) by changing a digit.

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, 812031 + ... + 812110.

Almost surely, 2^64965640 is an apocalyptic number.

It is an amenable number.

64965640 is an abundant number, since it is smaller than the sum of its proper divisors (81207140).

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

64965640 is a wasteful number, since it uses less digits than its factorization.

64965640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624152 (or 1624148 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 64965640 is about 8060.1265498750. The cubic root of 64965640 is about 402.0017161218.

The spelling of 64965640 in words is "sixty-four million, nine hundred sixty-five thousand, six hundred forty".