64378455 has 16 divisors (see below), whose sum is σ = 103403520. Its totient is φ = 34202528.

The previous prime is 64378453. The next prime is 64378493. The reversal of 64378455 is 55487346.

It is a cyclic number.

It is not a de Polignac number, because 64378455 - 2¹ = 64378453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64378451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4215 + ... + 12104.

It is an arithmetic number, because the mean of its divisors is an integer number (6462720).

Almost surely, 2^64378455 is an apocalyptic number.

64378455 is a deficient number, since it is larger than the sum of its proper divisors (39025065).

64378455 is a wasteful number, since it uses less digits than its factorization.

64378455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16590.

The product of its digits is 403200, while the sum is 42.

The square root of 64378455 is about 8023.6185726890. The cubic root of 64378455 is about 400.7868988769.

The spelling of 64378455 in words is "sixty-four million, three hundred seventy-eight thousand, four hundred fifty-five".