65278401 has 4 divisors (see below), whose sum is σ = 87037872. Its totient is φ = 43518932.

The previous prime is 65278399. The next prime is 65278417. The reversal of 65278401 is 10487256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65278401 - 2¹ = 65278399 is a prime.

It is a super-2 number, since 2×65278401² = 8522539274233602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65278481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10879731 + ... + 10879736.

It is an arithmetic number, because the mean of its divisors is an integer number (21759468).

Almost surely, 2^65278401 is an apocalyptic number.

It is an amenable number.

65278401 is a deficient number, since it is larger than the sum of its proper divisors (21759471).

65278401 is a wasteful number, since it uses less digits than its factorization.

65278401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21759470.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 65278401 is about 8079.5049972136. The cubic root of 65278401 is about 402.6457962365.

The spelling of 65278401 in words is "sixty-five million, two hundred seventy-eight thousand, four hundred one".