64979870 has 32 divisors (see below), whose sum is σ = 119992320. Its totient is φ = 25328160.

The previous prime is 64979869. The next prime is 64979891. The reversal of 64979870 is 7897946.

It is a happy number.

It is a Curzon number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 65075 + ... + 66065.

It is an arithmetic number, because the mean of its divisors is an integer number (3749760).

Almost surely, 2^64979870 is an apocalyptic number.

64979870 is a deficient number, since it is larger than the sum of its proper divisors (55012450).

64979870 is a wasteful number, since it uses less digits than its factorization.

64979870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 64979870 is about 8061.0092420242. The cubic root of 64979870 is about 402.0310653122.

The spelling of 64979870 in words is "sixty-four million, nine hundred seventy-nine thousand, eight hundred seventy".