65378691 has 24 divisors (see below), whose sum is σ = 112673040. Its totient is φ = 37358496.

The previous prime is 65378681. The next prime is 65378699. The reversal of 65378691 is 19687356.

It is a happy number.

It is not a de Polignac number, because 65378691 - 2²³ = 56990083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65378699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23386 + ... + 26031.

It is an arithmetic number, because the mean of its divisors is an integer number (4694710).

Almost surely, 2^65378691 is an apocalyptic number.

65378691 is a deficient number, since it is larger than the sum of its proper divisors (47294349).

65378691 is a wasteful number, since it uses less digits than its factorization.

65378691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49440 (or 49427 counting only the distinct ones).

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

The square root of 65378691 is about 8085.7090598166. The cubic root of 65378691 is about 402.8518913821.

The spelling of 65378691 in words is "sixty-five million, three hundred seventy-eight thousand, six hundred ninety-one".