64478401 has 6 divisors (see below), whose sum is σ = 69819990. Its totient is φ = 59518368.

The previous prime is 64478377. The next prime is 64478411. The reversal of 64478401 is 10487446.

It can be written as a sum of positive squares in 3 ways, for example, as 462400 + 64016001 = 680^2 + 8001^2 .

It is not a de Polignac number, because 64478401 - 2¹¹ = 64476353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64478411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190596 + ... + 190933.

It is an arithmetic number, because the mean of its divisors is an integer number (11636665).

Almost surely, 2^64478401 is an apocalyptic number.

It is an amenable number.

64478401 is a deficient number, since it is larger than the sum of its proper divisors (5341589).

64478401 is a wasteful number, since it uses less digits than its factorization.

64478401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381555 (or 381542 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 64478401 is about 8029.8443945073. The cubic root of 64478401 is about 400.9941956403.

The spelling of 64478401 in words is "sixty-four million, four hundred seventy-eight thousand, four hundred one".