65625278 has 16 divisors (see below), whose sum is σ = 104872320. Its totient is φ = 30709656.

The previous prime is 65625269. The next prime is 65625299. The reversal of 65625278 is 87252656.

It is a super-2 number, since 2×65625278² = 8613354225154568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7250 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (6554520).

Almost surely, 2^65625278 is an apocalyptic number.

65625278 is a deficient number, since it is larger than the sum of its proper divisors (39247042).

65625278 is a wasteful number, since it uses less digits than its factorization.

65625278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20911.

The product of its digits is 201600, while the sum is 41.

The square root of 65625278 is about 8100.9430315242. The cubic root of 65625278 is about 403.3577310713.

The spelling of 65625278 in words is "sixty-five million, six hundred twenty-five thousand, two hundred seventy-eight".