64195209928 has 16 divisors (see below), whose sum is σ = 122637076380. Its totient is φ = 31491989568.

The previous prime is 64195209893. The next prime is 64195209929. The reversal of 64195209928 is 82990259146.

64195209928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 57196548964 + 6998660964 = 239158^2 + 83658^2 .

It is not an unprimeable number, because it can be changed into a prime (64195209929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75701475 + ... + 75702322.

Almost surely, 2^64195209928 is an apocalyptic number.

It is an amenable number.

64195209928 is a deficient number, since it is larger than the sum of its proper divisors (58441866452).

64195209928 is a wasteful number, since it uses less digits than its factorization.

64195209928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151403856 (or 151403852 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 64195209928 in words is "sixty-four billion, one hundred ninety-five million, two hundred nine thousand, nine hundred twenty-eight".