64198919 has 8 divisors (see below), whose sum is σ = 68202288. Its totient is φ = 60220800.

The previous prime is 64198913. The next prime is 64198949. The reversal of 64198919 is 91989146.

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

It is not a de Polignac number, because 64198919 - 2¹⁶ = 64133383 is a prime.

It is a super-2 number, since 2×64198919² = 8243002401537122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64198913) 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, 932 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (8525286).

Almost surely, 2^64198919 is an apocalyptic number.

64198919 is a deficient number, since it is larger than the sum of its proper divisors (4003369).

64198919 is a wasteful number, since it uses less digits than its factorization.

64198919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12625.

The product of its digits is 139968, while the sum is 47.

The square root of 64198919 is about 8012.4227921397. The cubic root of 64198919 is about 400.4139859746.

The spelling of 64198919 in words is "sixty-four million, one hundred ninety-eight thousand, nine hundred nineteen".