64205491 has 8 divisors (see below), whose sum is σ = 73708544. Its totient is φ = 54785160.

The previous prime is 64205483. The next prime is 64205521. The reversal of 64205491 is 19450246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64205491 - 2³ = 64205483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64205411) 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, 19005 + ... + 22126.

It is an arithmetic number, because the mean of its divisors is an integer number (9213568).

Almost surely, 2^64205491 is an apocalyptic number.

64205491 is a deficient number, since it is larger than the sum of its proper divisors (9503053).

64205491 is a wasteful number, since it uses less digits than its factorization.

64205491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41361.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 64205491 is about 8012.8328948007. The cubic root of 64205491 is about 400.4276488782.

It can be divided in two parts, 6420 and 5491, that added together give a palindrome (11911).

The spelling of 64205491 in words is "sixty-four million, two hundred five thousand, four hundred ninety-one".