65413778 has 8 divisors (see below), whose sum is σ = 100513980. Its totient is φ = 31909120.

The previous prime is 65413769. The next prime is 65413783. The reversal of 65413778 is 87731456.

It can be written as a sum of positive squares in 2 ways, for example, as 40742689 + 24671089 = 6383^2 + 4967^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398783 + ... + 398946.

Almost surely, 2^65413778 is an apocalyptic number.

65413778 is a deficient number, since it is larger than the sum of its proper divisors (35100202).

65413778 is a wasteful number, since it uses less digits than its factorization.

65413778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797772.

The product of its digits is 141120, while the sum is 41.

The square root of 65413778 is about 8087.8784610057. The cubic root of 65413778 is about 402.9239451163.

The spelling of 65413778 in words is "sixty-five million, four hundred thirteen thousand, seven hundred seventy-eight".