65781364 has 24 divisors (see below), whose sum is σ = 132971328. Its totient is φ = 28141440.

The previous prime is 65781319. The next prime is 65781379. The reversal of 65781364 is 46318756.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43224 + ... + 44719.

It is an arithmetic number, because the mean of its divisors is an integer number (5540472).

Almost surely, 2^65781364 is an apocalyptic number.

It is an amenable number.

65781364 is an abundant number, since it is smaller than the sum of its proper divisors (67189964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65781364 is a wasteful number, since it uses less digits than its factorization.

65781364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87975 (or 87973 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 65781364 is about 8110.5711266223. The cubic root of 65781364 is about 403.6772656986.

The spelling of 65781364 in words is "sixty-five million, seven hundred eighty-one thousand, three hundred sixty-four".