64991930 has 8 divisors (see below), whose sum is σ = 116985492. Its totient is φ = 25996768.

The previous prime is 64991921. The next prime is 64991933. The reversal of 64991930 is 3919946.

It can be written as a sum of positive squares in 2 ways, for example, as 59706529 + 5285401 = 7727^2 + 2299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (64991933) 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, 3249587 + ... + 3249606.

Almost surely, 2^64991930 is an apocalyptic number.

64991930 is a deficient number, since it is larger than the sum of its proper divisors (51993562).

64991930 is a wasteful number, since it uses less digits than its factorization.

64991930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499200.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 64991930 is about 8061.7572526094. The cubic root of 64991930 is about 402.0559355513.

The spelling of 64991930 in words is "sixty-four million, nine hundred ninety-one thousand, nine hundred thirty".