64128747 has 8 divisors (see below), whose sum is σ = 85551760. Its totient is φ = 42729120.

The previous prime is 64128731. The next prime is 64128749. The reversal of 64128747 is 74782146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64128747 - 2⁴ = 64128731 is a prime.

It is a super-2 number, since 2×64128747² = 8224992383580018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64128749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2097 + ... + 11517.

It is an arithmetic number, because the mean of its divisors is an integer number (10693970).

Almost surely, 2^64128747 is an apocalyptic number.

64128747 is a deficient number, since it is larger than the sum of its proper divisors (21423013).

64128747 is a wasteful number, since it uses less digits than its factorization.

64128747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11693.

The product of its digits is 75264, while the sum is 39.

The square root of 64128747 is about 8008.0426447416. The cubic root of 64128747 is about 400.2680432586.

The spelling of 64128747 in words is "sixty-four million, one hundred twenty-eight thousand, seven hundred forty-seven".