64948139 has 4 divisors (see below), whose sum is σ = 67187760. Its totient is φ = 62708520.

The previous prime is 64948133. The next prime is 64948153. The reversal of 64948139 is 93184946.

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 64948139 - 2⁴ = 64948123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64948139.

It is not an unprimeable number, because it can be changed into a prime (64948133) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1119767 + ... + 1119824.

It is an arithmetic number, because the mean of its divisors is an integer number (16796940).

Almost surely, 2^64948139 is an apocalyptic number.

64948139 is a deficient number, since it is larger than the sum of its proper divisors (2239621).

64948139 is a wasteful number, since it uses less digits than its factorization.

64948139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239620.

The product of its digits is 186624, while the sum is 44.

The square root of 64948139 is about 8059.0408238202. The cubic root of 64948139 is about 401.9656146591.

The spelling of 64948139 in words is "sixty-four million, nine hundred forty-eight thousand, one hundred thirty-nine".