649076905638 has 192 divisors, whose sum is σ = 1823174092800. Its totient is φ = 170022162240.

The previous prime is 649076905601. The next prime is 649076905649. The reversal of 649076905638 is 836509670946.

649076905638 is a `hidden beast` number, since 6 + 4 + 9 + 0 + 7 + 69 + 0 + 563 + 8 = 666.

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

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 95 ways as a sum of consecutive naturals, for example, 1350256 + ... + 1766732.

It is an arithmetic number, because the mean of its divisors is an integer number (9495698400).

Almost surely, 2^649076905638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649076905638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911587046400).

649076905638 is an abundant number, since it is smaller than the sum of its proper divisors (1174097187162).

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

649076905638 is a wasteful number, since it uses less digits than its factorization.

649076905638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416552 (or 416539 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 63.

The spelling of 649076905638 in words is "six hundred forty-nine billion, seventy-six million, nine hundred five thousand, six hundred thirty-eight".