64780965 has 60 divisors (see below), whose sum is σ = 124237476. Its totient is φ = 32182272.

The previous prime is 64780951. The next prime is 64780967. The reversal of 64780965 is 56908746.

It can be written as a sum of positive squares in 6 ways, for example, as 42849 + 64738116 = 207^2 + 8046^2 .

It is not a de Polignac number, because 64780965 - 2¹² = 64776869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 64780965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64780967) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 667797 + ... + 667893.

Almost surely, 2^64780965 is an apocalyptic number.

It is an amenable number.

64780965 is a deficient number, since it is larger than the sum of its proper divisors (59456511).

64780965 is an equidigital number, since it uses as much as digits as its factorization.

64780965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 64780965 is about 8048.6623112167. The cubic root of 64780965 is about 401.6204370119.

The spelling of 64780965 in words is "sixty-four million, seven hundred eighty thousand, nine hundred sixty-five".