64538357 has 4 divisors (see below), whose sum is σ = 69502860. Its totient is φ = 59573856.

The previous prime is 64538333. The next prime is 64538363. The reversal of 64538357 is 75383546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5340721 + 59197636 = 2311^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 64538357 - 2²⁴ = 47761141 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 (64538557) 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, 2482232 + ... + 2482257.

It is an arithmetic number, because the mean of its divisors is an integer number (17375715).

Almost surely, 2^64538357 is an apocalyptic number.

It is an amenable number.

64538357 is a deficient number, since it is larger than the sum of its proper divisors (4964503).

64538357 is a wasteful number, since it uses less digits than its factorization.

64538357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4964502.

The product of its digits is 302400, while the sum is 41.

The square root of 64538357 is about 8033.5768496978. The cubic root of 64538357 is about 401.1184468601.

The spelling of 64538357 in words is "sixty-four million, five hundred thirty-eight thousand, three hundred fifty-seven".