64278455 has 8 divisors (see below), whose sum is σ = 77475312. Its totient is φ = 51195328.

The previous prime is 64278449. The next prime is 64278481. The reversal of 64278455 is 55487246.

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

It is a cyclic number.

It is not a de Polignac number, because 64278455 - 2²² = 60084151 is a prime.

It is a Duffinian 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, 27182 + ... + 29451.

It is an arithmetic number, because the mean of its divisors is an integer number (9684414).

Almost surely, 2^64278455 is an apocalyptic number.

64278455 is a deficient number, since it is larger than the sum of its proper divisors (13196857).

64278455 is a wasteful number, since it uses less digits than its factorization.

64278455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56865.

The product of its digits is 268800, while the sum is 41.

The square root of 64278455 is about 8017.3845485919. The cubic root of 64278455 is about 400.5792752788.

It can be divided in two parts, 642 and 78455, that added together give a palindrome (79097).

The spelling of 64278455 in words is "sixty-four million, two hundred seventy-eight thousand, four hundred fifty-five".