64642825 has 12 divisors (see below), whose sum is σ = 86323468. Its totient is φ = 47736000.

The previous prime is 64642771. The next prime is 64642829. The reversal of 64642825 is 52824646.

It can be written as a sum of positive squares in 6 ways, for example, as 16908544 + 47734281 = 4112^2 + 6909^2 .

It is not a de Polignac number, because 64642825 - 2¹¹ = 64640777 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64642829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99126 + ... + 99775.

Almost surely, 2^64642825 is an apocalyptic number.

64642825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64642825 is a deficient number, since it is larger than the sum of its proper divisors (21680643).

64642825 is a wasteful number, since it uses less digits than its factorization.

64642825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198924 (or 198919 counting only the distinct ones).

The product of its digits is 92160, while the sum is 37.

The square root of 64642825 is about 8040.0761812311. The cubic root of 64642825 is about 401.3347598363.

The spelling of 64642825 in words is "sixty-four million, six hundred forty-two thousand, eight hundred twenty-five".