64887819 has 8 divisors (see below), whose sum is σ = 89500560. Its totient is φ = 41766816.

The previous prime is 64887811. The next prime is 64887881. The reversal of 64887819 is 91878846.

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

It is not a de Polignac number, because 64887819 - 2³ = 64887811 is a prime.

It is a super-2 number, since 2×64887819² = 8420858109153522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64887811) 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, 372832 + ... + 373005.

It is an arithmetic number, because the mean of its divisors is an integer number (11187570).

Almost surely, 2^64887819 is an apocalyptic number.

64887819 is a deficient number, since it is larger than the sum of its proper divisors (24612741).

64887819 is a wasteful number, since it uses less digits than its factorization.

64887819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745869.

The product of its digits is 774144, while the sum is 51.

The square root of 64887819 is about 8055.2975736468. The cubic root of 64887819 is about 401.8411354650.

The spelling of 64887819 in words is "sixty-four million, eight hundred eighty-seven thousand, eight hundred nineteen".