64774770440 has 64 divisors (see below), whose sum is σ = 148550837760. Its totient is φ = 25411160320.

The previous prime is 64774770433. The next prime is 64774770521. The reversal of 64774770440 is 4407747746.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7981985 + ... + 7990095.

It is an arithmetic number, because the mean of its divisors is an integer number (2321106840).

Almost surely, 2^64774770440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64774770440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74275418880).

64774770440 is an abundant number, since it is smaller than the sum of its proper divisors (83776067320).

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

64774770440 is a wasteful number, since it uses less digits than its factorization.

64774770440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11942 (or 11938 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 50.

The spelling of 64774770440 in words is "sixty-four billion, seven hundred seventy-four million, seven hundred seventy thousand, four hundred forty".