64648421 has 2 divisors, whose sum is σ = 64648422. Its totient is φ = 64648420.

The previous prime is 64648403. The next prime is 64648429. The reversal of 64648421 is 12484646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 16900321 = 6910^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 64648421 - 2⁶ = 64648357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64648429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32324210 + 32324211.

It is an arithmetic number, because the mean of its divisors is an integer number (32324211).

Almost surely, 2^64648421 is an apocalyptic number.

It is an amenable number.

64648421 is a deficient number, since it is larger than the sum of its proper divisors (1).

64648421 is an equidigital number, since it uses as much as digits as its factorization.

64648421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 35.

The square root of 64648421 is about 8040.4241803527. The cubic root of 64648421 is about 401.3463404178.

The spelling of 64648421 in words is "sixty-four million, six hundred forty-eight thousand, four hundred twenty-one".