64478745 has 24 divisors (see below), whose sum is σ = 115619400. Its totient is φ = 33202176.

The previous prime is 64478741. The next prime is 64478747. The reversal of 64478745 is 54787446.

It can be written as a sum of positive squares in 4 ways, for example, as 4756761 + 59721984 = 2181^2 + 7728^2 .

It is not a de Polignac number, because 64478745 - 2² = 64478741 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 64478745.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64478741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23400 + ... + 26009.

It is an arithmetic number, because the mean of its divisors is an integer number (4817475).

Almost surely, 2^64478745 is an apocalyptic number.

It is an amenable number.

64478745 is a deficient number, since it is larger than the sum of its proper divisors (51140655).

64478745 is a wasteful number, since it uses less digits than its factorization.

64478745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49449 (or 49446 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 64478745 is about 8029.8658145700. The cubic root of 64478745 is about 400.9949087564.

The spelling of 64478745 in words is "sixty-four million, four hundred seventy-eight thousand, seven hundred forty-five".