64506550 has 12 divisors (see below), whose sum is σ = 119982276. Its totient is φ = 25802600.

The previous prime is 64506511. The next prime is 64506557. The reversal of 64506550 is 5560546.

It is a super-2 number, since 2×64506550² = 8322189985805000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64506557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 645016 + ... + 645115.

It is an arithmetic number, because the mean of its divisors is an integer number (9998523).

Almost surely, 2^64506550 is an apocalyptic number.

64506550 is a deficient number, since it is larger than the sum of its proper divisors (55475726).

64506550 is a wasteful number, since it uses less digits than its factorization.

64506550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290143 (or 1290138 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 64506550 is about 8031.5969769405. The cubic root of 64506550 is about 401.0525404671.

It can be divided in two parts, 64506 and 550, that added together give a palindrome (65056).

The spelling of 64506550 in words is "sixty-four million, five hundred six thousand, five hundred fifty".