64973918 has 4 divisors (see below), whose sum is σ = 97460880. Its totient is φ = 32486958.

The previous prime is 64973917. The next prime is 64973947. The reversal of 64973918 is 81937946.

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

It is a super-2 number, since 2×64973918² = 8443220040541448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64973917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16243478 + ... + 16243481.

It is an arithmetic number, because the mean of its divisors is an integer number (24365220).

Almost surely, 2^64973918 is an apocalyptic number.

64973918 is a deficient number, since it is larger than the sum of its proper divisors (32486962).

64973918 is a wasteful number, since it uses less digits than its factorization.

64973918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32486961.

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

The square root of 64973918 is about 8060.6400490284. The cubic root of 64973918 is about 402.0187899107.

The spelling of 64973918 in words is "sixty-four million, nine hundred seventy-three thousand, nine hundred eighteen".