64671998 has 16 divisors (see below), whose sum is σ = 101398176. Its totient is φ = 30877440.

The previous prime is 64671979. The next prime is 64672019. The reversal of 64671998 is 89917646.

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 7 ways as a sum of consecutive naturals, for example, 46838 + ... + 48198.

It is an arithmetic number, because the mean of its divisors is an integer number (6337386).

Almost surely, 2^64671998 is an apocalyptic number.

64671998 is a deficient number, since it is larger than the sum of its proper divisors (36726178).

64671998 is a wasteful number, since it uses less digits than its factorization.

64671998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419.

The product of its digits is 653184, while the sum is 50.

The square root of 64671998 is about 8041.8902006929. The cubic root of 64671998 is about 401.3951242470.

The spelling of 64671998 in words is "sixty-four million, six hundred seventy-one thousand, nine hundred ninety-eight".