65378619 has 12 divisors (see below), whose sum is σ = 96632536. Its totient is φ = 42571872.

The previous prime is 65378609. The next prime is 65378623. The reversal of 65378619 is 91687356.

It is a happy number.

It is not a de Polignac number, because 65378619 - 2⁷ = 65378491 is a prime.

It is a super-2 number, since 2×65378619² = 8548727644694322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65378609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84082 + ... + 84855.

Almost surely, 2^65378619 is an apocalyptic number.

65378619 is a deficient number, since it is larger than the sum of its proper divisors (31253917).

65378619 is a wasteful number, since it uses less digits than its factorization.

65378619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168986 (or 168983 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 65378619 is about 8085.7046075157. The cubic root of 65378619 is about 402.8517434983.

The spelling of 65378619 in words is "sixty-five million, three hundred seventy-eight thousand, six hundred nineteen".