64128619 has 2 divisors, whose sum is σ = 64128620. Its totient is φ = 64128618.

The previous prime is 64128613. The next prime is 64128653. The reversal of 64128619 is 91682146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64128619 - 2³ = 64128611 is a prime.

It is a super-2 number, since 2×64128619² = 8224959549694322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64128611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32064309 + 32064310.

It is an arithmetic number, because the mean of its divisors is an integer number (32064310).

Almost surely, 2^64128619 is an apocalyptic number.

64128619 is a deficient number, since it is larger than the sum of its proper divisors (1).

64128619 is an equidigital number, since it uses as much as digits as its factorization.

64128619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 64128619 is about 8008.0346527722. The cubic root of 64128619 is about 400.2677769488.

The spelling of 64128619 in words is "sixty-four million, one hundred twenty-eight thousand, six hundred nineteen".