64420425 has 36 divisors (see below), whose sum is σ = 116716860. Its totient is φ = 33960960.

The previous prime is 64420351. The next prime is 64420427. The reversal of 64420425 is 52402446.

It can be written as a sum of positive squares in 6 ways, for example, as 356409 + 64064016 = 597^2 + 8004^2 .

It is not a de Polignac number, because 64420425 - 2¹⁵ = 64387657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64420427) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18417 + ... + 21633.

It is an arithmetic number, because the mean of its divisors is an integer number (3242135).

Almost surely, 2^64420425 is an apocalyptic number.

It is an amenable number.

64420425 is a deficient number, since it is larger than the sum of its proper divisors (52296435).

64420425 is a wasteful number, since it uses less digits than its factorization.

64420425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322 (or 3314 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 64420425 is about 8026.2335500532. The cubic root of 64420425 is about 400.8739744476.

The spelling of 64420425 in words is "sixty-four million, four hundred twenty thousand, four hundred twenty-five".