64561478 has 8 divisors (see below), whose sum is σ = 102538872. Its totient is φ = 30381856.

The previous prime is 64561477. The next prime is 64561489. The reversal of 64561478 is 87416546.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64561477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 949400 + ... + 949467.

It is an arithmetic number, because the mean of its divisors is an integer number (12817359).

Almost surely, 2^64561478 is an apocalyptic number.

64561478 is a deficient number, since it is larger than the sum of its proper divisors (37977394).

64561478 is a wasteful number, since it uses less digits than its factorization.

64561478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898886.

The product of its digits is 161280, while the sum is 41.

The square root of 64561478 is about 8035.0157436062. The cubic root of 64561478 is about 401.1663416458.

The spelling of 64561478 in words is "sixty-four million, five hundred sixty-one thousand, four hundred seventy-eight".