64766139 has 4 divisors (see below), whose sum is σ = 86354856. Its totient is φ = 43177424.

The previous prime is 64766123. The next prime is 64766171. The reversal of 64766139 is 93166746.

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

It is a cyclic number.

It is not a de Polignac number, because 64766139 - 2⁴ = 64766123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64766139.

It is not an unprimeable number, because it can be changed into a prime (64766179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10794354 + ... + 10794359.

It is an arithmetic number, because the mean of its divisors is an integer number (21588714).

Almost surely, 2^64766139 is an apocalyptic number.

64766139 is a deficient number, since it is larger than the sum of its proper divisors (21588717).

64766139 is a wasteful number, since it uses less digits than its factorization.

64766139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21588716.

The product of its digits is 163296, while the sum is 42.

The square root of 64766139 is about 8047.7412358997. The cubic root of 64766139 is about 401.5897959179.

The spelling of 64766139 in words is "sixty-four million, seven hundred sixty-six thousand, one hundred thirty-nine".