64781039 has 4 divisors (see below), whose sum is σ = 65693520. Its totient is φ = 63868560.

The previous prime is 64781023. The next prime is 64781063. The reversal of 64781039 is 93018746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93018746 = 2 ⋅46509373.

It is a cyclic number.

It is not a de Polignac number, because 64781039 - 2⁴ = 64781023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64780993 and 64781011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456134 + ... + 456275.

It is an arithmetic number, because the mean of its divisors is an integer number (16423380).

Almost surely, 2^64781039 is an apocalyptic number.

64781039 is a deficient number, since it is larger than the sum of its proper divisors (912481).

64781039 is an equidigital number, since it uses as much as digits as its factorization.

64781039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912480.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 64781039 is about 8048.6669082526. Note that the first 3 decimals coincide. The cubic root of 64781039 is about 401.6205899369.

The spelling of 64781039 in words is "sixty-four million, seven hundred eighty-one thousand, thirty-nine".