64890471 has 16 divisors (see below), whose sum is σ = 90160128. Its totient is φ = 41467200.

The previous prime is 64890451. The next prime is 64890481. The reversal of 64890471 is 17409846.

It is a happy number.

It is not a de Polignac number, because 64890471 - 2⁵ = 64890439 is a prime.

It is a super-3 number, since 3×64890471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6691 + ... + 13211.

It is an arithmetic number, because the mean of its divisors is an integer number (5635008).

Almost surely, 2^64890471 is an apocalyptic number.

64890471 is a deficient number, since it is larger than the sum of its proper divisors (25269657).

64890471 is a wasteful number, since it uses less digits than its factorization.

64890471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 64890471 is about 8055.4621841332. The cubic root of 64890471 is about 401.8466098781.

It can be divided in two parts, 648 and 90471, that added together give a palindrome (91119).

The spelling of 64890471 in words is "sixty-four million, eight hundred ninety thousand, four hundred seventy-one".