64440783 has 12 divisors (see below), whose sum is σ = 101543208. Its totient is φ = 39054960.

The previous prime is 64440781. The next prime is 64440787. The reversal of 64440783 is 38704446.

64440783 is a `hidden beast` number, since 644 + 4 + 0 + 7 + 8 + 3 = 666.

It is not a de Polignac number, because 64440783 - 2¹ = 64440781 is a prime.

It is a super-2 number, since 2×64440783² = 8305229027306178, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440781) 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 11 ways as a sum of consecutive naturals, for example, 325360 + ... + 325557.

It is an arithmetic number, because the mean of its divisors is an integer number (8461934).

Almost surely, 2^64440783 is an apocalyptic number.

64440783 is a deficient number, since it is larger than the sum of its proper divisors (37102425).

64440783 is a wasteful number, since it uses less digits than its factorization.

64440783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650934 (or 650931 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 64440783 is about 8027.5016661474. The cubic root of 64440783 is about 400.9161977686.

The spelling of 64440783 in words is "sixty-four million, four hundred forty thousand, seven hundred eighty-three".