64042645 has 4 divisors (see below), whose sum is σ = 76851180. Its totient is φ = 51234112.

The previous prime is 64042607. The next prime is 64042651. The reversal of 64042645 is 54624046.

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 14607684 + 49434961 = 3822^2 + 7031^2 .

It is a cyclic number.

It is not a de Polignac number, because 64042645 - 2⁹ = 64042133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6404260 + ... + 6404269.

It is an arithmetic number, because the mean of its divisors is an integer number (19212795).

Almost surely, 2^64042645 is an apocalyptic number.

It is an amenable number.

64042645 is a deficient number, since it is larger than the sum of its proper divisors (12808535).

64042645 is a wasteful number, since it uses less digits than its factorization.

64042645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12808534.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 64042645 is about 8002.6648686547. The cubic root of 64042645 is about 400.0888240243.

The spelling of 64042645 in words is "sixty-four million, forty-two thousand, six hundred forty-five".