64442557 has 2 divisors, whose sum is σ = 64442558. Its totient is φ = 64442556.

The previous prime is 64442551. The next prime is 64442561. The reversal of 64442557 is 75524446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57441241 + 7001316 = 7579^2 + 2646^2 .

It is a cyclic number.

It is not a de Polignac number, because 64442557 - 2³ = 64442549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64442551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32221278 + 32221279.

It is an arithmetic number, because the mean of its divisors is an integer number (32221279).

Almost surely, 2^64442557 is an apocalyptic number.

It is an amenable number.

64442557 is a deficient number, since it is larger than the sum of its proper divisors (1).

64442557 is an equidigital number, since it uses as much as digits as its factorization.

64442557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 37.

The square root of 64442557 is about 8027.6121605369. The cubic root of 64442557 is about 400.9198766955.

The spelling of 64442557 in words is "sixty-four million, four hundred forty-two thousand, five hundred fifty-seven".