65625778 has 16 divisors (see below), whose sum is σ = 99429120. Its totient is φ = 32484816.

The previous prime is 65625773. The next prime is 65625793. The reversal of 65625778 is 87752656.

It is not an unprimeable number, because it can be changed into a prime (65625773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119701 + ... + 120247.

It is an arithmetic number, because the mean of its divisors is an integer number (6214320).

Almost surely, 2^65625778 is an apocalyptic number.

65625778 is a deficient number, since it is larger than the sum of its proper divisors (33803342).

65625778 is a wasteful number, since it uses less digits than its factorization.

65625778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its digits is 705600, while the sum is 46.

The square root of 65625778 is about 8100.9738920700. The cubic root of 65625778 is about 403.3587554649.

The spelling of 65625778 in words is "sixty-five million, six hundred twenty-five thousand, seven hundred seventy-eight".