646299036 has 54 divisors (see below), whose sum is σ = 1688619296. Its totient is φ = 208209600.

The previous prime is 646299029. The next prime is 646299037. The reversal of 646299036 is 630992646.

It is a junction number, because it is equal to n+sod(n) for n = 646298982 and 646299000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646299037) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 848896 + ... + 849656.

Almost surely, 2^646299036 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 646299036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844309648).

646299036 is an abundant number, since it is smaller than the sum of its proper divisors (1042320260).

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

646299036 is a wasteful number, since it uses less digits than its factorization.

646299036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 646299036 is about 25422.4120806819. The cubic root of 646299036 is about 864.5919137118.

The spelling of 646299036 in words is "six hundred forty-six million, two hundred ninety-nine thousand, thirty-six".