64042505 has 4 divisors (see below), whose sum is σ = 76851012. Its totient is φ = 51234000.

The previous prime is 64042501. The next prime is 64042513. The reversal of 64042505 is 50524046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50524046 = 2 ⋅25262023.

It can be written as a sum of positive squares in 2 ways, for example, as 16418704 + 47623801 = 4052^2 + 6901^2 .

It is not a de Polignac number, because 64042505 - 2² = 64042501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64042501) 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, 6404246 + ... + 6404255.

It is an arithmetic number, because the mean of its divisors is an integer number (19212753).

Almost surely, 2^64042505 is an apocalyptic number.

It is an amenable number.

64042505 is a deficient number, since it is larger than the sum of its proper divisors (12808507).

64042505 is a wasteful number, since it uses less digits than its factorization.

64042505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12808506.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 64042505 is about 8002.6561215636. The cubic root of 64042505 is about 400.0885324869.

The spelling of 64042505 in words is "sixty-four million, forty-two thousand, five hundred five".