64977686 has 4 divisors (see below), whose sum is σ = 97466532. Its totient is φ = 32488842.

The previous prime is 64977683. The next prime is 64977721. The reversal of 64977686 is 68677946.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64977683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16244420 + ... + 16244423.

It is an arithmetic number, because the mean of its divisors is an integer number (24366633).

Almost surely, 2^64977686 is an apocalyptic number.

64977686 is a deficient number, since it is larger than the sum of its proper divisors (32488846).

64977686 is a wasteful number, since it uses less digits than its factorization.

64977686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32488845.

The product of its digits is 3048192, while the sum is 53.

The square root of 64977686 is about 8060.8737739776. The cubic root of 64977686 is about 402.0265611189.

The spelling of 64977686 in words is "sixty-four million, nine hundred seventy-seven thousand, six hundred eighty-six".