64919930 has 8 divisors (see below), whose sum is σ = 116855892. Its totient is φ = 25967968.

The previous prime is 64919929. The next prime is 64919963. The reversal of 64919930 is 3991946.

It can be written as a sum of positive squares in 2 ways, for example, as 61042969 + 3876961 = 7813^2 + 1969^2 .

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

It is a super-2 number, since 2×64919930² = 8429194622409800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 3245987 + ... + 3246006.

Almost surely, 2^64919930 is an apocalyptic number.

64919930 is a deficient number, since it is larger than the sum of its proper divisors (51935962).

64919930 is a wasteful number, since it uses less digits than its factorization.

64919930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492000.

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

The square root of 64919930 is about 8057.2904875026. The cubic root of 64919930 is about 401.9074108357.

The spelling of 64919930 in words is "sixty-four million, nine hundred nineteen thousand, nine hundred thirty".