64778934 has 64 divisors (see below), whose sum is σ = 148925952. Its totient is φ = 18604800.

The previous prime is 64778929. The next prime is 64778939. The reversal of 64778934 is 43987746.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64778929) and next prime (64778939).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64778939) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99799 + ... + 100445.

It is an arithmetic number, because the mean of its divisors is an integer number (2326968).

Almost surely, 2^64778934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64778934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74462976).

64778934 is an abundant number, since it is smaller than the sum of its proper divisors (84147018).

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

64778934 is a wasteful number, since it uses less digits than its factorization.

64778934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741.

The product of its digits is 1016064, while the sum is 48.

The square root of 64778934 is about 8048.5361401934. The cubic root of 64778934 is about 401.6162397932.

The spelling of 64778934 in words is "sixty-four million, seven hundred seventy-eight thousand, nine hundred thirty-four".