64477939 has 4 divisors (see below), whose sum is σ = 66220624. Its totient is φ = 62735256.

The previous prime is 64477867. The next prime is 64477943. The reversal of 64477939 is 93977446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64477939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64477892 and 64477901.

It is not an unprimeable number, because it can be changed into a prime (64477949) 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, 871287 + ... + 871360.

It is an arithmetic number, because the mean of its divisors is an integer number (16555156).

Almost surely, 2^64477939 is an apocalyptic number.

64477939 is a deficient number, since it is larger than the sum of its proper divisors (1742685).

64477939 is a wasteful number, since it uses less digits than its factorization.

64477939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742684.

The product of its digits is 1143072, while the sum is 49.

The square root of 64477939 is about 8029.8156267750. The cubic root of 64477939 is about 400.9932379048.

The spelling of 64477939 in words is "sixty-four million, four hundred seventy-seven thousand, nine hundred thirty-nine".