64919390 has 16 divisors (see below), whose sum is σ = 123005520. Its totient is φ = 24600960.

The previous prime is 64919389. The next prime is 64919399. The reversal of 64919390 is 9391946.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64919399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170651 + ... + 171030.

It is an arithmetic number, because the mean of its divisors is an integer number (7687845).

Almost surely, 2^64919390 is an apocalyptic number.

64919390 is a deficient number, since it is larger than the sum of its proper divisors (58086130).

64919390 is a wasteful number, since it uses less digits than its factorization.

64919390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341707.

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

The square root of 64919390 is about 8057.2569774086. The cubic root of 64919390 is about 401.9062964855.

The spelling of 64919390 in words is "sixty-four million, nine hundred nineteen thousand, three hundred ninety".