64190785 has 8 divisors (see below), whose sum is σ = 77475240. Its totient is φ = 51055104.

The previous prime is 64190779. The next prime is 64190807. The reversal of 64190785 is 58709146.

It can be written as a sum of positive squares in 4 ways, for example, as 39350529 + 24840256 = 6273^2 + 4984^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64190785 - 2¹⁷ = 64059713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36240 + ... + 37969.

It is an arithmetic number, because the mean of its divisors is an integer number (9684405).

Almost surely, 2^64190785 is an apocalyptic number.

It is an amenable number.

64190785 is a deficient number, since it is larger than the sum of its proper divisors (13284455).

64190785 is a wasteful number, since it uses less digits than its factorization.

64190785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74387.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 64190785 is about 8011.9151892665. The cubic root of 64190785 is about 400.3970744493.

The spelling of 64190785 in words is "sixty-four million, one hundred ninety thousand, seven hundred eighty-five".