65481578 has 4 divisors (see below), whose sum is σ = 98222370. Its totient is φ = 32740788.

The previous prime is 65481571. The next prime is 65481589. The reversal of 65481578 is 87518456.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 146689 = 8083^2 + 383^2 .

It is not an unprimeable number, because it can be changed into a prime (65481571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16370393 + ... + 16370396.

Almost surely, 2^65481578 is an apocalyptic number.

65481578 is a deficient number, since it is larger than the sum of its proper divisors (32740792).

65481578 is a wasteful number, since it uses less digits than its factorization.

65481578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32740791.

The product of its digits is 268800, while the sum is 44.

The square root of 65481578 is about 8092.0688331230. The cubic root of 65481578 is about 403.0631044365.

The spelling of 65481578 in words is "sixty-five million, four hundred eighty-one thousand, five hundred seventy-eight".