64401893 has 2 divisors, whose sum is σ = 64401894. Its totient is φ = 64401892.

The previous prime is 64401881. The next prime is 64401901. The reversal of 64401893 is 39810446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64288324 + 113569 = 8018^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 64401893 - 2⁴ = 64401877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64401853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200946 + 32200947.

It is an arithmetic number, because the mean of its divisors is an integer number (32200947).

Almost surely, 2^64401893 is an apocalyptic number.

It is an amenable number.

64401893 is a deficient number, since it is larger than the sum of its proper divisors (1).

64401893 is an equidigital number, since it uses as much as digits as its factorization.

64401893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 64401893 is about 8025.0790027264. The cubic root of 64401893 is about 400.8355305897.

The spelling of 64401893 in words is "sixty-four million, four hundred one thousand, eight hundred ninety-three".