64520433 has 12 divisors (see below), whose sum is σ = 93266628. Its totient is φ = 42981120.

The previous prime is 64520431. The next prime is 64520441. The reversal of 64520433 is 33402546.

It can be written as a sum of positive squares in 2 ways, for example, as 9345249 + 55175184 = 3057^2 + 7428^2 .

It is not a de Polignac number, because 64520433 - 2¹ = 64520431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64520397 and 64520406.

It is not an unprimeable number, because it can be changed into a prime (64520431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19113 + ... + 22233.

It is an arithmetic number, because the mean of its divisors is an integer number (7772219).

Almost surely, 2^64520433 is an apocalyptic number.

It is an amenable number.

64520433 is a deficient number, since it is larger than the sum of its proper divisors (28746195).

64520433 is a wasteful number, since it uses less digits than its factorization.

64520433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424 (or 5421 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 64520433 is about 8032.4612043881. The cubic root of 64520433 is about 401.0813097060.

Adding to 64520433 its reverse (33402546), we get a palindrome (97922979).

The spelling of 64520433 in words is "sixty-four million, five hundred twenty thousand, four hundred thirty-three".