64840634 has 8 divisors (see below), whose sum is σ = 101489760. Its totient is φ = 31010716.

The previous prime is 64840631. The next prime is 64840651. The reversal of 64840634 is 43604846.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 64840594 and 64840603.

It is not an unprimeable number, because it can be changed into a prime (64840631) 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, 704744 + ... + 704835.

It is an arithmetic number, because the mean of its divisors is an integer number (12686220).

Almost surely, 2^64840634 is an apocalyptic number.

64840634 is a deficient number, since it is larger than the sum of its proper divisors (36649126).

64840634 is a wasteful number, since it uses less digits than its factorization.

64840634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409604.

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 64840634 is about 8052.3682230757. The cubic root of 64840634 is about 401.7437084897.

The spelling of 64840634 in words is "sixty-four million, eight hundred forty thousand, six hundred thirty-four".