64778475 has 24 divisors (see below), whose sum is σ = 107364160. Its totient is φ = 34463520.

The previous prime is 64778459. The next prime is 64778503. The reversal of 64778475 is 57487746.

It is not a de Polignac number, because 64778475 - 2⁴ = 64778459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40236 + ... + 41814.

Almost surely, 2^64778475 is an apocalyptic number.

64778475 is a deficient number, since it is larger than the sum of its proper divisors (42585685).

64778475 is a wasteful number, since it uses less digits than its factorization.

64778475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139 (or 2134 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 48.

The square root of 64778475 is about 8048.5076256409. The cubic root of 64778475 is about 401.6152912220.

The spelling of 64778475 in words is "sixty-four million, seven hundred seventy-eight thousand, four hundred seventy-five".