64642025 has 18 divisors (see below), whose sum is σ = 93244590. Its totient is φ = 44325120.

The previous prime is 64642013. The next prime is 64642027. The reversal of 64642025 is 52024646.

It can be written as a sum of positive squares in 3 ways, for example, as 1073296 + 63568729 = 1036^2 + 7973^2 .

It is not a de Polignac number, because 64642025 - 2⁶ = 64641961 is a prime.

It is a super-2 number, since 2×64642025² = 8357182792201250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25160 + ... + 27609.

It is an arithmetic number, because the mean of its divisors is an integer number (5180255).

Almost surely, 2^64642025 is an apocalyptic number.

It is an amenable number.

64642025 is a deficient number, since it is larger than the sum of its proper divisors (28602565).

64642025 is a wasteful number, since it uses less digits than its factorization.

64642025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52793 (or 52781 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 64642025 is about 8040.0264303048. The cubic root of 64642025 is about 401.3331042304. Note that the first 3 decimals are identical.

The spelling of 64642025 in words is "sixty-four million, six hundred forty-two thousand, twenty-five".