64642075 has 36 divisors (see below), whose sum is σ = 89079120. Its totient is φ = 46435840.

The previous prime is 64642057. The next prime is 64642133. The reversal of 64642075 is 57024646.

It is not a de Polignac number, because 64642075 - 2⁷ = 64641947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64642075.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 165981 + ... + 166369.

It is an arithmetic number, because the mean of its divisors is an integer number (2474420).

Almost surely, 2^64642075 is an apocalyptic number.

64642075 is a deficient number, since it is larger than the sum of its proper divisors (24437045).

64642075 is a wasteful number, since it uses less digits than its factorization.

64642075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 64642075 is about 8040.0295397467. The cubic root of 64642075 is about 401.3332077062. Note that the first 3 decimals are identical.

The spelling of 64642075 in words is "sixty-four million, six hundred forty-two thousand, seventy-five".