64919395 has 4 divisors (see below), whose sum is σ = 77903280. Its totient is φ = 51935512.

The previous prime is 64919389. The next prime is 64919399. The reversal of 64919395 is 59391946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59391946 = 2 ⋅29695973.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64919395 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64919399) 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 3 ways as a sum of consecutive naturals, for example, 6491935 + ... + 6491944.

It is an arithmetic number, because the mean of its divisors is an integer number (19475820).

Almost surely, 2^64919395 is an apocalyptic number.

64919395 is a deficient number, since it is larger than the sum of its proper divisors (12983885).

64919395 is a wasteful number, since it uses less digits than its factorization.

64919395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12983884.

The product of its digits is 262440, while the sum is 46.

The square root of 64919395 is about 8057.2572876879. The cubic root of 64919395 is about 401.9063068036.

The spelling of 64919395 in words is "sixty-four million, nine hundred nineteen thousand, three hundred ninety-five".