649089126 has 80 divisors (see below), whose sum is σ = 1675677696. Its totient is φ = 183952944.

The previous prime is 649089109. The next prime is 649089131. The reversal of 649089126 is 621980946.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 141765 + ... + 146271.

Almost surely, 2^649089126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649089126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837838848).

649089126 is an abundant number, since it is smaller than the sum of its proper divisors (1026588570).

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

649089126 is a wasteful number, since it uses less digits than its factorization.

649089126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4655 (or 4646 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 649089126 is about 25477.2275964242. The cubic root of 649089126 is about 865.8342830148.

The spelling of 649089126 in words is "six hundred forty-nine million, eighty-nine thousand, one hundred twenty-six".