64229778 has 18 divisors (see below), whose sum is σ = 139238229. Its totient is φ = 21398592.

The previous prime is 64229773. The next prime is 64229797. The reversal of 64229778 is 87792246.

It can be written as a sum of positive squares in 2 ways, for example, as 64208169 + 21609 = 8013^2 + 147^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5667.

It is not an unprimeable number, because it can be changed into a prime (64229773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33058 + ... + 34946.

Almost surely, 2^64229778 is an apocalyptic number.

64229778 is an abundant number, since it is smaller than the sum of its proper divisors (75008451).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64229778 is an equidigital number, since it uses as much as digits as its factorization.

64229778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786 (or 1894 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 64229778 is about 8014.3482579683. The cubic root of 64229778 is about 400.4781324124.

The spelling of 64229778 in words is "sixty-four million, two hundred twenty-nine thousand, seven hundred seventy-eight".