64964778 has 32 divisors (see below), whose sum is σ = 135462912. Its totient is φ = 20746800.

The previous prime is 64964777. The next prime is 64964831. The reversal of 64964778 is 87746946.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64964778.

It is not an unprimeable number, because it can be changed into a prime (64964771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17463 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (4233216).

Almost surely, 2^64964778 is an apocalyptic number.

64964778 is an abundant number, since it is smaller than the sum of its proper divisors (70498134).

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

64964778 is a wasteful number, since it uses less digits than its factorization.

64964778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3530.

The product of its digits is 2032128, while the sum is 51.

The square root of 64964778 is about 8060.0730765918. The cubic root of 64964778 is about 401.9999381203. Note that the first 4 decimals are identical.

The spelling of 64964778 in words is "sixty-four million, nine hundred sixty-four thousand, seven hundred seventy-eight".