64971428 has 24 divisors (see below), whose sum is σ = 116743032. Its totient is φ = 31625984.

The previous prime is 64971421. The next prime is 64971457. The reversal of 64971428 is 82417946.

It can be written as a sum of positive squares in 4 ways, for example, as 27541504 + 37429924 = 5248^2 + 6118^2 .

It is not an unprimeable number, because it can be changed into a prime (64971421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27926 + ... + 30162.

It is an arithmetic number, because the mean of its divisors is an integer number (4864293).

Almost surely, 2^64971428 is an apocalyptic number.

It is an amenable number.

64971428 is a deficient number, since it is larger than the sum of its proper divisors (51771604).

64971428 is a wasteful number, since it uses less digits than its factorization.

64971428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431 (or 2429 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 64971428 is about 8060.4855933126. The cubic root of 64971428 is about 402.0136543137.

The spelling of 64971428 in words is "sixty-four million, nine hundred seventy-one thousand, four hundred twenty-eight".