649595278080 has 864 divisors, whose sum is σ = 2689355096064. Its totient is φ = 141543604224.

The previous prime is 649595278043. The next prime is 649595278109. The reversal of 649595278080 is 80872595946.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 649595277999 and 649595278017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1070173137 + ... + 1070173743.

Almost surely, 2^649595278080 is an apocalyptic number.

649595278080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649595278080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1344677548032).

649595278080 is an abundant number, since it is smaller than the sum of its proper divisors (2039759817984).

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

649595278080 is a wasteful number, since it uses less digits than its factorization.

649595278080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 649595278080 in words is "six hundred forty-nine billion, five hundred ninety-five million, two hundred seventy-eight thousand, eighty".