64542145 has 16 divisors (see below), whose sum is σ = 81829440. Its totient is φ = 48734784.

The previous prime is 64542143. The next prime is 64542187. The reversal of 64542145 is 54124546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64542145 - 2¹ = 64542143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64542143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28059 + ... + 30271.

It is an arithmetic number, because the mean of its divisors is an integer number (5114340).

Almost surely, 2^64542145 is an apocalyptic number.

It is an amenable number.

64542145 is a deficient number, since it is larger than the sum of its proper divisors (17287295).

64542145 is a wasteful number, since it uses less digits than its factorization.

64542145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544.

The product of its digits is 19200, while the sum is 31.

The square root of 64542145 is about 8033.8126067266. The cubic root of 64542145 is about 401.1262944256.

The spelling of 64542145 in words is "sixty-four million, five hundred forty-two thousand, one hundred forty-five".