649786542 has 8 divisors (see below), whose sum is σ = 1299573096. Its totient is φ = 216595512.

The previous prime is 649786537. The next prime is 649786549. The reversal of 649786542 is 245687946.

It is a sphenic number, since it is the product of 3 distinct primes.

649786542 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649786549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54148873 + ... + 54148884.

It is an arithmetic number, because the mean of its divisors is an integer number (162446637).

Almost surely, 2^649786542 is an apocalyptic number.

649786542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

649786542 is a wasteful number, since it uses less digits than its factorization.

649786542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108297762.

The product of its digits is 2903040, while the sum is 51.

The square root of 649786542 is about 25490.9109684217. The cubic root of 649786542 is about 866.1442715402.

It can be divided in two parts, 6497 and 86542, that added together give a palindrome (93039).

The spelling of 649786542 in words is "six hundred forty-nine million, seven hundred eighty-six thousand, five hundred forty-two".