64490761280 has 112 divisors (see below), whose sum is σ = 167974914240. Its totient is φ = 23388825600.

The previous prime is 64490761253. The next prime is 64490761331. The reversal of 64490761280 is 8216709446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309910 + ... + 1358250.

It is an arithmetic number, because the mean of its divisors is an integer number (1499776020).

Almost surely, 2^64490761280 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 64490761280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83987457120).

64490761280 is an abundant number, since it is smaller than the sum of its proper divisors (103484152960).

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

64490761280 is a wasteful number, since it uses less digits than its factorization.

64490761280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48748 (or 48738 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 64490761280 in words is "sixty-four billion, four hundred ninety million, seven hundred sixty-one thousand, two hundred eighty".