64739918 has 4 divisors (see below), whose sum is σ = 97109880. Its totient is φ = 32369958.

The previous prime is 64739881. The next prime is 64739921. The reversal of 64739918 is 81993746.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 16184978 + ... + 16184981.

It is an arithmetic number, because the mean of its divisors is an integer number (24277470).

Almost surely, 2^64739918 is an apocalyptic number.

64739918 is a deficient number, since it is larger than the sum of its proper divisors (32369962).

64739918 is a wasteful number, since it uses less digits than its factorization.

64739918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32369961.

The product of its digits is 326592, while the sum is 47.

The square root of 64739918 is about 8046.1119803294. Note that the first 3 decimals coincide. The cubic root of 64739918 is about 401.5355931736.

The spelling of 64739918 in words is "sixty-four million, seven hundred thirty-nine thousand, nine hundred eighteen".