64817428 has 12 divisors (see below), whose sum is σ = 122156020. Its totient is φ = 29915712.

The previous prime is 64817419. The next prime is 64817429. The reversal of 64817428 is 82471846.

It can be written as a sum of positive squares in 2 ways, for example, as 28601104 + 36216324 = 5348^2 + 6018^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64817429) 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, 623193 + ... + 623296.

Almost surely, 2^64817428 is an apocalyptic number.

It is an amenable number.

64817428 is a deficient number, since it is larger than the sum of its proper divisors (57338592).

64817428 is a wasteful number, since it uses less digits than its factorization.

64817428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246506 (or 1246504 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 64817428 is about 8050.9271515770. The cubic root of 64817428 is about 401.6957757026.

The spelling of 64817428 in words is "sixty-four million, eight hundred seventeen thousand, four hundred twenty-eight".