64401250 has 20 divisors (see below), whose sum is σ = 120716046. Its totient is φ = 25760000.

The previous prime is 64401247. The next prime is 64401251. The reversal of 64401250 is 5210446.

It can be written as a sum of positive squares in 5 ways, for example, as 4941729 + 59459521 = 2223^2 + 7711^2 .

It is not an unprimeable number, because it can be changed into a prime (64401251) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24511 + ... + 27010.

Almost surely, 2^64401250 is an apocalyptic number.

64401250 is a deficient number, since it is larger than the sum of its proper divisors (56314796).

64401250 is an equidigital number, since it uses as much as digits as its factorization.

64401250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51543 (or 51528 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 64401250 is about 8025.0389407155. The cubic root of 64401250 is about 400.8341965808.

Adding to 64401250 its reverse (5210446), we get a palindrome (69611696).

The spelling of 64401250 in words is "sixty-four million, four hundred one thousand, two hundred fifty".