65197878 has 8 divisors (see below), whose sum is σ = 130395768. Its totient is φ = 21732624.

The previous prime is 65197849. The next prime is 65197879. The reversal of 65197878 is 87879156.

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

65197878 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 65197878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65197879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5433151 + ... + 5433162.

It is an arithmetic number, because the mean of its divisors is an integer number (16299471).

Almost surely, 2^65197878 is an apocalyptic number.

65197878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

65197878 is a wasteful number, since it uses less digits than its factorization.

65197878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10866318.

The product of its digits is 846720, while the sum is 51.

The square root of 65197878 is about 8074.5202953488. The cubic root of 65197878 is about 402.4801692839.

The spelling of 65197878 in words is "sixty-five million, one hundred ninety-seven thousand, eight hundred seventy-eight".