649106880 has 168 divisors, whose sum is σ = 2176253712. Its totient is φ = 163897344.

The previous prime is 649106879. The next prime is 649106891. The reversal of 649106880 is 88601946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345624 + ... + 347496.

Almost surely, 2^649106880 is an apocalyptic number.

649106880 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 649106880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088126856).

649106880 is an abundant number, since it is smaller than the sum of its proper divisors (1527146832).

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

649106880 is a wasteful number, since it uses less digits than its factorization.

649106880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 649106880 is about 25477.5760228480. The cubic root of 649106880 is about 865.8421770934.

The spelling of 649106880 in words is "six hundred forty-nine million, one hundred six thousand, eight hundred eighty".