64493557 has 4 divisors (see below), whose sum is σ = 64733580. Its totient is φ = 64253536.

The previous prime is 64493551. The next prime is 64493567. The reversal of 64493557 is 75539446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75539446 = 2 ⋅37769723.

It can be written as a sum of positive squares in 2 ways, for example, as 2414916 + 62078641 = 1554^2 + 7879^2 .

It is a cyclic number.

It is not a de Polignac number, because 64493557 - 2¹¹ = 64491509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64493551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119608 + ... + 120145.

It is an arithmetic number, because the mean of its divisors is an integer number (16183395).

Almost surely, 2^64493557 is an apocalyptic number.

It is an amenable number.

64493557 is a deficient number, since it is larger than the sum of its proper divisors (240023).

64493557 is a wasteful number, since it uses less digits than its factorization.

64493557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240022.

The product of its digits is 453600, while the sum is 43.

The square root of 64493557 is about 8030.7880684277. The cubic root of 64493557 is about 401.0256118035.

The spelling of 64493557 in words is "sixty-four million, four hundred ninety-three thousand, five hundred fifty-seven".