64856745 has 24 divisors (see below), whose sum is σ = 115459656. Its totient is φ = 33654528.

The previous prime is 64856723. The next prime is 64856749. The reversal of 64856745 is 54765846.

64856745 is a `hidden beast` number, since 6 + 48 + 567 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 38601369 + 26255376 = 6213^2 + 5124^2 .

It is not a de Polignac number, because 64856745 - 2¹⁷ = 64725673 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 64856745.

It is not an unprimeable number, because it can be changed into a prime (64856749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17812 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (4810819).

Almost surely, 2^64856745 is an apocalyptic number.

It is an amenable number.

64856745 is a deficient number, since it is larger than the sum of its proper divisors (50602911).

64856745 is a wasteful number, since it uses less digits than its factorization.

64856745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39001 (or 38998 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 64856745 is about 8053.3685498678. The cubic root of 64856745 is about 401.7769795858.

The spelling of 64856745 in words is "sixty-four million, eight hundred fifty-six thousand, seven hundred forty-five".