64545518 has 4 divisors (see below), whose sum is σ = 96818280. Its totient is φ = 32272758.

The previous prime is 64545511. The next prime is 64545539. The reversal of 64545518 is 81554546.

It is a happy number.

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

It is a super-2 number, since 2×64545518² = 8332247787776648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64545511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16136378 + ... + 16136381.

It is an arithmetic number, because the mean of its divisors is an integer number (24204570).

Almost surely, 2^64545518 is an apocalyptic number.

64545518 is a deficient number, since it is larger than the sum of its proper divisors (32272762).

64545518 is a wasteful number, since it uses less digits than its factorization.

64545518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32272761.

The product of its digits is 96000, while the sum is 38.

The square root of 64545518 is about 8034.0225292191. The cubic root of 64545518 is about 401.1332819809.

Subtracting 64545518 from its reverse (81554546), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 64545518 in words is "sixty-four million, five hundred forty-five thousand, five hundred eighteen".